someone make this it would be so good
#Mod that lets you convert packs/other mods to updated or downgraded versions
old mulch
indigo abyss
Unfortunately it's simply not possible. It requires manual coding in nearly every case.
proven verge
🤦 of course, why hasn't anybody thought to simply do that /s
but anyway sarcasm aside, you do have options, there are mods that add new features to old versions and vice versa
vale pier
https://github.com/Mojang/slicer for resource packs
never used it so not sure how good it really is, but probably good enough for a lot of packs