I already know it's theoretically enough, people here have fixed their Switch with just the raw backup, but it's a long process you have to follow to manually rebuild boot0/1. My question was if a large part of the process could be skipped by already having keys.txt, plus whether restoring a new boot0/1 backup even works with an older version's raw eMMC backup. If I'd need to do a full backup again, that's going to take so much time that I might as well not bother and do the slow process to rebuild boot0/1 in the unlikely case that I'll actually need it.I don't know if it's enough, I would advise to make a backup regardless.
In the case you need it,you'll be glad you did it instead of being sorry you didnt