Red coloured "comb" area on 7 week Patridge Chanteclers?

Of my four Patridge Chanteclers, 2 have a more red coloured comb area, while the other 2 have no colour to the area. They are pure Patridge Chanteclers with no combs or wattles (7 weeks old now).

Also, one of the girl's (with the more red coloured skin in her wattle area) has a slight roundness to the area. Is this what is referred to as a "cushion comb"? Do I have anything to be concerned about or is this all normal?