my suspicion would be their is some wheaton blood in there, or brown/red, all of out ones we called brown/red naf a spekled \"crown\" on their heads, although thye were also a red shade of brown for body color.
On the Buff orpingtons, while the have deeper color, the are not showable as the \"smutt\" as I hear d breeders call it, is a DQ, the brown staining ion the feathers.
I purchased a Buff Orpington Rooster fro Larry, and while he has a couple white feathers in his tail, (also a DQ), I have to say I never saw such deep color in the chicks, no brown, just a bright orange/buff color right from the start. They are still too young to know how the will turn out, but they are just about featherd with thei first set, ans so far look real promising.