Arg B&W, Red, Blue and columbian tegus are all different species. I'm sure they would mate but it probably won't produce offspring. If it does the offspring would be called a hybrid and would probably be infertile. Recently there has been some success breeding blue + red but I don't know if they're old enough to tell fertility yet. A good example of this is a mule; it is a hybrid from a donkey and a horse and is infertile.