I can say all the other rescues / adoptee's I have taken in went right to f/t rats no issues, or f/t mouse with my Corn.
But between my Corn and Boa I'm sure those guys would eat whatever I had on hand, They like FOOD
and I had no clue what they were being fed before, adopting a snake third hand you get little info on them usually.
I just wondered about Monty because of his age and they were very specific on his eating needs