@ErinM31 It all depends on who you ask. In the species list they were combined into one. Though a lot of people don't agree. From what I have seen, a number of their arguments are on color but also a few other differences. I don't know what they look at to determine what denotes a new species over just being a different color of the same species. I do know people often get confused trying to identify local snakes as some species have 10-20 or more different colors patterns so they are often thought to be different species.
To my knowledge, most people in the hobby keep them separate when breeding just to be safe.