As long as they're both the same sex and the size difference isn't too big you should be fine. Just keep a careful eye on them, especially during feeding time. You may want to separate one for feeding, especially until you get used to how they act around each other. Make sure they don't have any food residue on them/smell like food after a feeding too. You just don't want a food fight to break out because you don't know how they'll react around food when there's another snake around.