These are both pullets, right?

[WyoChick1]

Pretty sure they are, but just questioning my luck at having zero suspected roos out of 11 chicks, Lol. These two have different colored tails, does that mean anything? Barred Rocks, 4-5 weeks old.
Thanks!

 

[nuthatched]

I'm leaning cockerel from the barring but can you get better pictures of the combs

 

[WyoChick1]

They are Barred Rocks, about a month old. I know that's pretty young yet. They are dark like pullets are supposed to be, but not exactly the same. As for the combs, still small and yellow. None of my chicks are showing anything comb-wise, but maybe they're too young yet.