That second BO is somewhat of show quality. Here are some hatchery photos of BO's:
Hatchery breeder birds are selected for mass egg production. The more productive the breeder...the better. That being said...many hatcheries "attempt" to stick to the Standard of Perfection...but true Show birds are much less productive than hatchery stock. So...the more productive birds are selected for breeders. Hence giving "quality" birds the boot and bring undesired genetics into play in hatchery lines.
How old is your buff orpington? My 6 buff orpington hens are hatchery stock. A couple months ago they looked thinner like yours, since they have filled out and become more "round" like the "show quality" hen.