a) Haven't changed my .vimrc between the specified versions:

if has("patch-8.1.360")
    set diffopt=internal,filler,context:3,indent-heuristic,algorithm:minimal
else
...
endif

b) No difference in :scriptnames output.

c) :set all:

--- Options ---
  ambiwidth=single    clipboard=        nodiff                
foldignore=#        imstatusfunc=       makeencoding=       
pastetoggle=        selection=old       spellfile=        
notextmode          novisualbell
noautochdir           cmdheight=1         diffexpr=           
foldlevel=0         includeexpr=        makeprg=make        
patchexpr=          selectmode=         spelllang=en        
textwidth=190     nowarn
  autoindent          cmdwinheight=20   nodigraph             
foldlevelstart=-1   incsearch           matchtime=5         
patchmode=          shell=cmd.exe       spellsuggest=best   
thesaurus=        noweirdinvert
noautoread            colorcolumn=        directory=d:\temp   
foldmethod=manual   indentexpr=         maxcombine=2      
nopreserveindent      shellcmdflag=/c   nosplitbelow          
tildeop             wildchar=<Tab>
noautowrite           columns=226         display=lastline    
foldminlines=0      infercase           maxfuncdepth=100    
previewheight=12    shellquote=       nosplitright        
notimeout             wildcharm=0
noautowriteall        comments=           eadirection=both    
foldnestmax=20    noinsertmode          maxmapdepth=1000    
previewpopup=     noshellslash        nostartofline         
timeoutlen=1000   nowildignorecase
  background=light  nocompatible        noedcompatible        
formatexpr=         isprint=@,~-255     maxmem=8240710    
nopreviewwindow       shelltemp           suffixesadd=        
title               wildmenu
nobackup              complete=.,b,i      emoji               
formatprg=        nojoinspaces          maxmemtot=8240710   
printdevice=        shellxquote=(     noswapfile            
titlelen=85         wildmode=full
  backupcopy=auto     concealcursor=n     encoding=utf-8    
nogdefault            key=                menuitems=25        
prompt              shiftround          swapsync=fsync      
titlestring=        wildoptions=
  backupext=~         conceallevel=0      endofline           
guifontwide=        keymap=             modeline            
pumheight=0         shiftwidth=3        switchbuf=        
nottimeout            winaltkeys=no
  balloondelay=600    completefunc=       equalalways         
guipty              keymodel=startsel nomodelineexpr        
pumwidth=15         shortmess=aIOtT     synmaxcol=3000      
ttimeoutlen=-1      wincolor=
noballooneval         completepopup=      equalprg=           
guitablabel=%t      keywordprg=:help    modelines=5         
quoteescape=\     noshortname           syntax=             
ttybuiltin          window=80
  balloonexpr=      noconfirm           noerrorbells          
guitabtooltip=      langmap=            modifiable        
noreadonly            showbreak=>>        tabline=            
ttyfast             winheight=1
  belloff=          nocopyindent          esckeys             
helpheight=20       langmenu=none     nomodified            
redrawtime=2000     showcmd             tabpagemax=10       
ttyscroll=999     nowinfixheight
nobinary              cscopepathcomp=0    eventignore=        
helplang=de       nolangnoremap         more                
regexpengine=0      showfulltag         tabstop=3           
undodir=.         nowinfixwidth
nobomb                cscopeprg=cscope    expandtab           
hidden              langremap           mouse=a           
norelativenumber    noshowmatch           tagbsearch        
noundofile            winminheight=1
  breakindent       nocscoperelative    noexrc                
history=600         laststatus=2      nomousefocus          
remap             noshowmode            tagcase=followic    
undolevels=500      winminwidth=1
  browsedir=buffer  nocscopetag           fileencoding=       
hlsearch            lazyredraw          mousehide           
report=0            showtabline=1       tagfunc=            
undoreload=10000    winwidth=20
  bufhidden=          cscopetagorder=0    fileformat=unix     
icon                linebreak           mousemodel=extend   
restorescreen       sidescroll=25       taglength=0         
updatecount=200   nowrap
  buflisted           cscopeverbose       fileignorecase      
iconstring=         lines=81            mousetime=500     
noruler               sidescrolloff=15    tagrelative         
updatetime=4000     wrapmargin=0
  buftype=          nocursorbind          filetype=           
ignorecase          linespace=1         number              
rulerformat=        signcolumn=auto     tags=./tags,tags    
varsofttabstop=     wrapscan
  cdpath=,,         nocursorcolumn      nofixendofline        
imactivatefunc=   nolisp                numberwidth=4       
scroll=26           smartcase           tagstack            
vartabstop=         write
  cedit=^F          nocursorline          foldclose=        
noimcmdline         nolist                omnifunc=         
noscrollbind        nosmartindent         term=builtin_gui    
verbose=0         nowriteany
  charconvert=        debug=              foldcolumn=0      
noimdisable           loadplugins       noopendevice          
scrolljump=1        smarttab            termencoding=       
verbosefile=      nowritebackup
nocindent           nodelcombine          foldenable          
iminsert=0          magic               operatorfunc=       
scrolloff=5         softtabstop=0     noterse               
viminfofile=        writedelay=0
  cinoptions=         dictionary=         foldexpr=0          
imsearch=-1         makeef=           nopaste             
nosecure            nospell               textauto            
virtualedit=block
  backspace=eol,indent,start
  backupdir=.,d:\temp,c:\tmp,c:\temp
  backupskip=d:\temp\*,d:\temp\*
  breakat= ^I!@*-+;:,./?
  breakindentopt=sbr
  casemap=internal,keepascii
  cinkeys=0{,0},0),0],:,0#,!^F,o,O,e
  cinwords=if,else,while,do,for,switch
  commentstring=/*%s*/
  completeopt=menu,preview,longest
  completeslash=slash
  cpoptions=ABcfijs$
  cryptmethod=blowfish2
  cscopequickfix=s-,c-,d-,i-,t-,e-
  cursorlineopt=both
  define=^\s*#\s*define
  diffopt=internal,filler,context:3,indent-heuristic,algorithm:minimal
  errorfile=errors.err
  errorformat=%f(%l) \=: %t%*\D%n: %m,%*[^"]"%f"%*\D%l: %m,%f(%l) \=: 
%m,%*[^ ] %f %l: %m,%f:%l:%c:%m,%f(%l):%m,%f:%l:%m,%f|%l| %m
  fileencodings=ucs-bom,utf-8,latin1,koi8-r
  fileformats=unix,dos,mac
  fillchars=diff: ,vert: ,fold:-
  foldmarker={{{,}}}
  foldopen=block,mark,percent,quickfix,search,tag,undo
  foldtext=foldtext()
  formatoptions=cjnq
  formatlistpat=^\s*\d\+[\]:.)}\t ]\s*
  grepformat=%f:%l:%m
  grepprg=g:start_rg -Hn --no-heading'
  
guicursor=n-v-c:block-Cursor/lCursor-blinkwait250-blinkon500-blinkoff500,i-ci:ver25-CursorModify/lCursor-blinkwait250-blinkon500-blinkoff500,r-cr:block-CursorModify/lCursor-blinkwait250-blinkon500-blinkoff500-,o:block-CursorWait-blinkon0,ve:ver25-Cursor
  guifont=DejaVu_Sans_Mono:h8
  guioptions=Abeghmrt
  helpfile=k:\bin\vim\doc\help.txt
  
highlight=8:SpecialKey,~:EndOfBuffer,@:NonText,d:Directory,e:ErrorMsg,i:IncSearch,l:Search,m:MoreMsg,M:ModeMsg,n:LineNr,N:CursorLineNr,r:Question,s:StatusLine,S:StatusLineNC,c:VertSplit,t:Title,v:Visual,V:VisualNOS,w:WarningMsg,W:WildMenu,f:Folded,F:FoldColumn,A:DiffAdd,C:DiffChange,D:DiffDelete,T:DiffText,>:SignColumn,-:Conceal,B:SpellBad,P:SpellCap,R:SpellRare,L:SpellLocal,+:Pmenu,=:PmenuSel,x:PmenuSbar,X:PmenuThumb,*:TabLine,#:TabLineSel,_:TabLineFill,!:CursorColumn,.:CursorLine,o:ColorColumn,q:QuickFixLine,z:StatusLineTerm,Z:StatusLineTermNC
  include=^\s*#\s*include
  indentkeys=0{,0},0),0],:,0#,!^F,o,O,e
  isfname=@,48-57,/,\,.,-,_,+,,,#,$,%,{,},[,],:,@-@,!,~,=
  isident=@,48-57,_,128-167,224-235
  iskeyword=@,48-57,_,192-255
  
lispwords=defun,define,defmacro,set!,lambda,if,case,let,flet,let*,letrec,do,do*,define-syntax,let-syntax,letrec-syntax,destructuring-bind,defpackage,defparameter,defstruct,deftype,defvar,do-all-symbols,do-external-symbols,do-symbols,dolist,dotimes,ecase,etypecase,eval-when,labels,macrolet,multiple-value-bind,multiple-value-call,multiple-value-prog1,multiple-value-setq,prog1,progv,typecase,unless,unwind-protect,when,with-input-from-string,with-open-file,with-open-stream,with-output-to-string,with-package-iterator,define-condition,handler-bind,handler-case,restart-bind,restart-case,with-simple-restart,store-value,use-value,muffle-warning,abort,continue,with-slots,with-slots*,with-accessors,with-accessors*,defclass,defmethod,print-unreadable-object
  listchars=tab:» ,trail:·,eol:$,nbsp:¯
  matchpairs=(:),[:],{:},<:>
  maxmempattern=1000
  mkspellmem=460000,2000,500
  
mouseshape=i-r:beam,s:updown,sd:udsizing,vs:leftright,vd:lrsizing,m:no,ml:up-arrow,v:rightup-arrow
  nrformats=bin,octal,hex
  
packpath=~/vimfiles,k:\bin\vim/vimfiles,k:\bin\vim,k:\bin\vim/vimfiles/after,~/vimfiles/after
  paragraphs=IPLPPPQPP TPHPLIPpLpItpplpipbp
  
path=k:\bin\vim\.vim,k:\bin\vim,k:\bin\vim\.vim/colors,k:\bin\vim\.vim/indent,k:\bin\vim\.vim/keymap,k:\bin\vim\.vim/plugin,k:\bin\vim\.vim/scripts,k:\bin\vim\.vim/syntax,k:\bin\vim/syntax,k:\bin\vim\.vim/templates,k:\bin\vim/vimperator/colors
  printfont=DejaVu_Sans_Mono:h8
  printheader=%<%f%h%m%=Page %N
  
printoptions=left:10mm,right:10mm,top:10mm,bottom:10mm,header:0,wrap:n,jobsplit:y,portrait:n
  runtimepath=k:\bin\vim\.vim,k:\bin\vim
  scrollopt=ver,jump,hor
  sections=SHNHH HUnhsh
  sessionoptions=curdir,options,resize,winpos,winsize
  shellpipe=>%s 2>&1
  shellredir=>%s 2>&1
  shellxescape="&|<>()@^
  spellcapcheck=[.?!]\_[\])'"^I ]\+
  statusline=%!Statusline()
  suffixes=.bak,~,.o,.h,.info,.swp,.obj
  titleold=Thanks for flying Vim
  ttytype=builtin_gui
  viewdir=k:\bin\vim/.vim/views
  viewoptions=folds,options,cursor,curdir
  viminfo='200,<50,nk:/bin/vim/.vim/../.viminfo
  whichwrap=b,s,h,l,<,>,[,]
  wildignore=*.a,*.dll,*.exe,*.o

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