I missed the one feather stub on the lighter blue one. I really am not seeing enough to assume they're mixed. If they had body type, skin, or eye color off that would be another thing. I raise English Orps and I'm just not seeing enough wrong to think they aren't as well. They both have just a few stubs which according to this article may even be caused by a different gene than feathered legs and are more likely to occur in males. Stubs occur in quite a few breeds and while I haven't had them occur in my Orps, I have had them occur in show lines of another clean legged breed. Ewe Crazy Farms has stated that it's a common problem in English Orps as well.
http://www.edelras.nl/chickengenetics/mutations2.html#gen_mut_footfeath
https://www.backyardchickens.com/th...ed-chocolate-orpington-juvenile-pairs.818689/
http://www.edelras.nl/chickengenetics/mutations2.html#gen_mut_footfeath
https://www.backyardchickens.com/th...ed-chocolate-orpington-juvenile-pairs.818689/