I love it when it works!I was afraid you might have trouble finding the exact size of baby-rat. So if your snake took rats for the breeder, now you know either rodent type is acceptable.
One thing though, you might look inside the hides & all, just to make SURE, since a hopper mouse has eyes open and WILL chew on a snake that refuses to eat them, once they get hungry enough & there's nothing but the snake for them to eat. It has happened...so don't let it happen to yours! One indication that the snake took the live rodent is to listen for that "squeak".But hopper mice are aware enough to hide also.
So if you're not absolutely SURE the snake ate it, please do look. Don't make the mistake of waiting for morning- by then, your snake could be chewed up.