It is possible, but its also getting a pretty good comb as well. Its likely a cockerel, but not impossible to be a pullet. Wait a couple more weeks and you'll know for sure.
In English Orpingtons the pullets feather in a lot faster than the males. So the dark one is definitely a cockerel, and I think one of the light ones is as well. I'd say they are out a silver laced crossed to a white. I don't raise any silver laced so I'm no help with pics, sorry.