I'm pretty sure that if you made a Mojave Albino Piebald, that the snake would be at least 95% white with only slight yellow on the head. It would be a crazy snake non-the-less, but probably wouldn't have the Albino Piebald effect.

Co-doms seem to make the pied gene go full bore and mostly white, spieds, lesser pieds, mojave pieds, bumblebee pieds, etc.