The TL;DR was in the middle of the post (not the best place for sure!):
[There are] packages that are by default in Trisquel but not in Trisquel
Mini; (...) packages that are by default in Trisquel Mini but not in
Trisquel. Whatever the edition, you can then install any package on top of
it. Including those by default in the other edition. In fact, Trisquel even
has a NetInstall where only a base system (nothing graphical for instance) is
installed by default.
As for the wiki pages listing the applications installed by default in
Trisquel and in Trisquel Mini:
https://trisquel.info/en/wiki/trisquel
https://trisquel.info/en/wiki/trisquel-mini
