I would liken them to Lesser/Butter, different lines of pretty much the same morph. Both make Black-eyed white snakes with varying degrees of yellow splotching. As of today, I don't think a result of a cross between Fire X Sulfur has been successful/made public.
Here goes a pic of my Sulfur Mojave:
Note: this is an exceptional example of the morph (IMO, I may be a little biased).
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