Rats and Corns ARE the same thing. For some reason, the powers that be made Corns their own genus a few years ago. Rats are Elaphe, Corns are now Pantherophis. I guess it probably has something to do with how Corns stand out on their own so much. Whatever, they're essentially all the same type of snake. However, for best husbandry practices, they shouldn't be housed together except for breeding purposes. But otherwise, all husbandry practices are the same for both genuses (caging, heating, feeding, etc).