8 week old- help with breed identification and if one of them is a cockerel

[J-Habs]

I have some pullets that look exactly like that. I hatched them from a barred crested olive egger hen and a Splash Marans rooster, which I believe passes the blue gene. If yours both come from the barred crested olive egger like mine and a non barred rooster, boys would have barring. I see one of yours has the crest on its head, so it's possible she came from a hen like mine. I'm not sure why both don't have the crest though.