patch sounds too specific... like an actual patch file tied to the actual contents of the patch.
change is probably the right word, you want to change something, the exact operations of the change (multiple revisions of different patches) can evolve over time.
Maybe because I have never used an actual patch file, but patch just feels right to me. As an end user, a patch is an intentional delta blob resulting in some difference to the software. Writing software is just organizing those deltas. If I need to cherry pick between branches, pulling a patch from one to another feels more right than “changes” as a collective object.
change is probably the right word, you want to change something, the exact operations of the change (multiple revisions of different patches) can evolve over time.