Second bird--still young, but I'm thinking barred rock cockeral. The little bit of comb already starting, plus the abundance of white in the barring, makes me think male, But it's still early.
Cute chicks.To me it looks like first chick is a roo but, breed ? and I think the second is a barred rock pullet. My barred rock chicks are about the same feathering and my little roos combs are already turning pinklish red.