I would take the one you found to a vet. They can do samples and make sure there is no problems and check for things like worms. They can also probe (if they are experenced) and tell you if it is a girl or boy. I would go to the local pet shops and ask them if anyone reported a lost snake (I wouldnt say what type it is). Good luck and I am glad you seperated them. Watch both snakes well as yours might of picked up something from the other one.