These are the exact same parts (Mechanically, perhaps not performance 
wise), right down to the mask set which has not changed since 2001:  Every 
layer in the set has the same revision between these two parts.

New LM4871 from Digikey:
http://ppl.ug/i4CUcbOKElY/

>From the LM4871 data sheet:
http://ppl.ug/j1G65GS5644/

LM4871 date code is 32AC = 2003 or 2013, weeks 12 to 17, Die run "AC"
(Probably 2013 because Digikey has thousands of them.  It looks like these 
were introduced in 1997: http://ppl.ug/n7kz2l2RUmo/)

LM9022 date code is 449E = 2004, weeks 24 to 29, Die run "9E"
(Not 1984 or 1994 etc as the mask set is from 2001, not 2014 as I owned 
these many years ago.  It looks like these were released in 2001: 
http://ppl.ug/myU2AVIrnZc/)

jt

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