CG, the size difference could be many things. The buff could have been one of the first in her group to hatch and the SB Pom could have been one of the last. The Buff could have come from a larger egg too, or larger breeding stock. Weights on hatchery sites are averages of adult flocks so there can be some difference in individuals.
Very very cute! Glad they arrived A-Ok.
grandpa swears they arent day olds.
hes trying to tell me the chicks have wing feathers and they don't