I have some 7 weeks old Orpington chicks and the boys have huge combs and wattles already. It just means your redder girl is maturing faster than your other one so will start laying first. Her comb doesn't look overly large for a pullet nearing laying. The egg song is loud clucks with a longer "bourkgarg" kinda sound at the end. You'll think something is wrong to start with as it sounds like an alarm call. Some hens do it but others just quietly go about their business.The buff has a very red comb, waddles and is now red all around its eyes. While the other buff we have is very pale colored comb and smaller waddles.