They.... are quit a bit darker than my Buff Orpingtons. What do you think?
There can be some differences in color depending on the strain, especially with hatchery birds. Also, your older hens are probably going to molt soon. So like mine, their feathers are probably looking relatively dry and faded right now in preparation for molting. Also, Buff Orp's color can fade some with age. Your pullets are definitely not partridge or buff laced.