So I was at MARS yesterday and a vendor had a few blond pastels and a few "normal" pastels on display (among many other cool morphs).

I asked what the difference between them was and he said it was mainly just the genetics although blond pastels sometimes hold their yellow a little better...

Any more thoughts on the matter? I'm still a little confused because as far as I could tell, the two blond pastels looked exactly like the two normal pastels