Are these Barred Rocks even though they are so brown?

[Meggers]

Hi! I’m not hugely familiar with the barred rock breed, and recently got 3 “barred rock” chicks and I’m starting so wonder if they are actually mixed with a different breed or are just a totally different breed. In the back of the one pic I know that is a splash Ameraucana/easter egger, just wondering about the 2 other chicks lol

 

[HorseGirlAbby]

The one on the right in the second photo could be pure, but the other two are definitely mixes of some sort.