Hi! First time chicken owner here. A few weeks ago I got 6 chicks. Two of them are easter eggers, 2 are sapphires gems, and the other 2 in question are supposed to be Columbian Wyandottes, but they don't really look like the pictures I've seen. They don't have white feathers and, compared to when I first got them (see pics 1 & 2 below) there's some variation between how the two of them look now (see pics 3 & 4) with one being lighter and the other being a bit darker . They're only a few weeks old -- 4 ish by my estimate. Any ideas?