It would be pretty easy to tell if this snake had any other morphs. Some snakes, such as Pumpkin Pieds (Yellowbelly Pieds) have pixiling around the saddles that make them easier to identify. This guy is just a normal pied. The only snakes you would have to breed out to see what genes there are are 90% or higher white pieds (and this is only in some cases) or "White Weddings" which are all white pieds. I hope this helps! Of course it's possible he has hets which would need to be proven by breeding.