Is this a silkie? If so, a boy?

I can't tell the gender from the photos, so closer ones would definitely help. You partridge one is probably a hatchery-quality Silkie or a Silkie mix. Hatcheries don't really care about the quality of their Silkies, more about the quantity and the general characteristics (fluffy feathers, cute puffy look, etc).

 

I agree. Many hatchery birds lack characteristics like feathered legs, five toes, and a crest. They just aren't bred to be show-quality.

 

Your partridge Silkie is almost definitely a rooster, as his comb is rather developed for a Silkie of that age. As for your white Silkie, I'm not sure, but I'm leaning towards rooster, as well. But I'd just keep them until they either crow, or lay an egg, as Silkies are always difficult to sex.

 

Your Partridge Silkie is a Silkie, but not a show-quality one. I know that you got them from a breeder, but a good breeder would not have Silkies like this. They'll make great pets, though.