With it being the two of the kittens suffering from diarrhea, I would have suspected feline enteritis, which is indeed contagious. And very dangerous and potentially life threatening to the kittens.

What did your vet say? Was it diet related or enteritis?

And yes, everyone has a different opininon when it comes to diet Follow the advice your vet has given you!

Personally, when kittens are as ill as this, raw is not the best thing to recommend imo. As it requires ALOT of research to do it right (taurine levels in certain cuts etc), and in a sick kitten not the best idea due to dangers in feeding raw meat. Though can see the reasoning behind it.....To eliminate dietary issues causing the diarrhea.

So glad your little ones are on the mend, and thanks for updating us all on their situation. (Sorry, just noticed this thread). x