Super mojave is a Lucy (a dirty one, but still)

Leucism is a lack of ALL pigments. Any snake that is a Lucy (ignoring pieds, which are a form of leucism) will be white. Mind that mojaves are a weaker gene of it and there would probably be some pigmentation, but I would assume that the super mojave super black pastel would look like a super mojave, perhaps its patches will be darker, or perhaps it would be cleaner.