I agree that it looks like a pastel lesser. At the same time, that individual snake could well be a pastel mojave or pastel butter that just happens to look more like a lesser. I personally think they are all gorgeous, and if you were looking to get something like it, I would say buy whichever animal whose individual looks you like the best, and use the answers/guesses people have given you here to go about your search! Either way, it is an awesome looking animal!