Your gold bird looks like a pullet, both in comb and feather pattern.My two EEs are 7 weeks old this week...I’m hoping pullets! The comb on Nala (the black and white) has always been more of a pale pinky skin color than yellow. Amelia is definitely becoming the leader of the flock, she’s a bossy little lady.
The silver bird is harder to tell. It is showing a more patchy feather pattern (solid white area on wing) and the comb is rather wide and lumpy. Both of these things tend to be male traits. Yours is not showing definite cockerel traits at this point... more like "could be" cockerel traits. If Nala's comb starts turning bright pink or red in the next week or so, then I would expect a cockerel. There are a lot of changes going on at this stage, so you will have to wait a little longer to be sure one way or the other.