RIR and Jersey Giant mix?

[Bliss_chick]

I received fertilized eggs from someone who has a backyard flock. She believes the eggs were from her RIR rooster and JG hen, but the 2 chicks that hatched look significantly different and differ in size as well. They are 4 weeks old, and appear to be hens. The first 2 photos are of the black chick with grey legs, which is smaller than the other. The second 2 pics are of the brown headed chick, which has pink legs and is bigger. I’m curious if any has opinions on what breeds they may be?

 

[Rhodebar Lover]

They both appear to have pea combs and potentially beards so I would guess they’re Easter Egger mixed of some sort. The JG could be the father