mmm. Not sure about that. Wyandottes have yellow legs. The pic I have included is of my wyandottes.
Does and of the birds have 5 toes? Possibly coming out in a strange spot? They looks like silkies a silkie mix to me. But certainly not full since the feathers are too fully formed. Can you send over a shot of the feet? Also the feet look feathered. again this is a silkie trait. Not too many breeds have feathered feet. Cochin do as well as some others.
I think they are both pullets from what I can see. Again, some more pics would be helpful.
They look like silkie mixes to me, especially if they have 5 toes. The dark skin is usually telling, and the crests on mixes are small and don't really show up until they get older.