oh LORD NO, you do not want to feed a snake that will get big in size on only a pinkie diet. I hated the thought of switching my cornsnake to live till my friend had to rehome her kingsnake and gave it to me because I know what I'm doing. Well he was one live, my cornsnake wasn't. I soon noticed a little after getting this kingsnake my cornsnake lost its taste for anything frozen. Wouldn't eat for 2 months, it worried me. So I switched to live and he is bouncing with joy when he sees his meal every two weeks. I was scared out of my mind to feed either of them live, but its a very cool and remarkable experience if you are doing it for the first time. As long as my snakes are happy, I am. Those boys are my life.
but to the point, with a boa and ball python they shouldn't be even eating frozen-thawed. They should be on live mainly from the get go. Your snakes will start losing the taste for your thawed pinkies and not eat. But don't worry, it wont hurt them if they don't eat for a few months, but its most likely they want that thrill of killing the prey not having it handed to them. Frozen doesn't give them the protein they need while they are growing to stay healthy. But your ball python and boa will get big enough to eat rabbits.