Hmm I'm not an expert but i think Pastel/ Super pastel i one gene... Pastel is just visual het for super/pastel and super/pastel is just homozygous form of pastel.. I'm getting lost LOL. but this is how it works in Co-dom morphs I think. In Dominant morphs like Spider you Can have Super/Spider as well is a homozygous form of Spider Gene Is just not visual and You can't tell with one is with but still this is the same gene different alleles
So i Agree that killer bee is 2 gene mutation.
P.S.
Sorry I know my English suckeven after 5 years i US LOL