Two 'super forms' is absolutely possible as long as the mutations lie on different loci, which cinny and lesser do. And yes, a Super Cinny Super Lesser would produce all cinny lessers.

I imagine the snake in question would be grey/brown color.
I've seen a Black Pastel Cinny Butter, and it was a solid brown snake.
I plan on doing this combo someday in the far future with the Black Pastel gene instead of cinny.