So, a good while ago when I was trying to update a partial of a VXAce game, my process was this (so you may see how mad one would have to be to do it this way lol): get the version the partial TL was made for (readily available most of the time, let's say v1.00), compare the files of the decrypted v1.00 with the files of the patch (I use WinMerge for that - probably much better alternatives for that around, though) which lets me see what files've been changed and how.
Then I -similarly- compare the decrypted v1.00 with the new decrypted v1.0x, which let's me see what files/assets have been changed (and how). I take note of these files and try to incorporate the changes I can see bw the v1.00 and v1.0x files into the v1.00 TL files, effectively making them a v1.0x TL file.
Of course for this I would need something to decrypt the rvdata2 and etc files to something more managable and actually comparable...
Skills/Actors/Enemies etc. are not too big a hassle this way most of the time, but Mapinfos and the actual Map*** files would be a nightmare. Don't even know if the changes in Mapinfos and Map*** actually do amount to anything... Yet there ARE some map events that get changed with some content adding version-up, and let's not even talk about CommonEvents.... lol
At any rate, in this particular game, if I compare the .rvdata2 files of a version v1.1 and a v1.11, there are very few differences (Actors, Armors, CommonEvents, Enemies, Map036/044/048/093, Skills, System and Troops.rvdata2. Yet if I decrypt those, to be able to actually compare and edit if needed for the update,
only CommonEvents, System and the Map036/044/048/093.yaml files seem to be different, the rest, identical. WTF.
I guess I can't even be sure of the decrypting process being a success...