The reddish one might be a red sexlink pullet. (There are other things it could be, but if it came from a store, that's the most likely.)
The darker one is probably some sort of Cochin, unless it's a mix. No idea on gender for that one.
If you post pictures again in a month or two, we can make better guesses.
If you want to be looking up different breeds and comparing them, some details to pay attention to:
--feathered feet (dark one) or not (red one)
--comb type (I think they're both single, but it can be hard to tell when they are little)
--foot & leg color (I think they have yellow skin, not white or blue or green)
--crest on the head (I don't see any)
--muffs or beard on the face (the red one has none, I'm not positive about the dark one. If it grows up to have muff/beard, it would NOT be a Cochin.)
--feather texture (normal, silkied, frizzled)
--toes (normal is 3 facing forward, 1 backward, on each foot. Some breeds have an extra toe in the back.)
--feather color
The feather color is usually most obvious, but the other details are sometimes very helpful for sorting out similar breeds.
I will post more pictures in a few weeks and give updates
