I think it should be fine. A ball python's mouth/jaw can stretch a pretty good bit. I was a little worried when I first gave a couple of mine rat pups, but they took them down like champs. Just keep an eye on it, but I think you're good. Better safe than sorry. I've only been doing this a couple of months, and I learned it's always best to ask a dumb question and get an answer, then to ignore a potential problem and end up with a hurt animal.