Picture1 ( not counting duplicate) and 2- pullet
Picture 3 and 4 chick in front is a pullet
Picture 5- and 6- cockerel
7 and beyond- looks like a pullet.
How old are they, by looking at the amount of feathers I would guess four to five weeks. If that is close in age a CX would be four to five pounds and my Batches of CX's that we have done dont't usually have that good of a feather covering.