Nope. Might want to consider keeping them on f/t tho. It is easier if you have a small collection. especially if you already have some that feed live only....

Think about it. if you buy a live rat for your live eater and they refuse it, you can euthanize him and store him for one of your t/f eaters. If not you have to keep him alive for a week or more, of course he will get bigger and bigger each and every day!

why would you want to feed live when you don't have to?