Dan Honour who I respect highly as a Leghorn guy told me the "Danish" browns are more or less the hatchery type in America. They're lighter birds, smaller, more narrow, you'll notice a lot of shafting in the hackle, etc. It's the same general color and pattern as standardbred light browns, but much less refined.
I don't think it'd be a stretch to say all hatchery browns are of this type. Standardbred Light Browns are very different creatures. I have a Cackle hatchery brown hen in with my standardbred browns and she sticks out like a sore thumb—small, pinched, lots of light yellowish shafts showing up in her hackle, mossiness galore. Generally inferior quality, basically. She also doesn't lay any better than the standardbred birds. The only reason I still have her is because I couldn't catch her when I sold the others.
Depending on your project and what else you're using, I'd say a hatchery brown would be a setback... unless you're going for small flighty birds. Bud Blankenship sells chicks once spring rolls around. Worth the wait.