The first chick looks like either a dark Blue Cochin, or a Black Cochin--the white wing feathers are relatively common in young blue or black birds.The second one could be a poor quality Silver-Laced Cochin or some sort of mix.
Your first Cochin is a black or dark blue Cochin. As Bantamlover21 said, white feathers are fairly common in black or blue birds. Your second chick may be a Silver-Laced Cochin, but it will be easier to tell when he/she is older.
For # 2 that is whitish down the middle of the feathers. #1 looks black but around the edges of his feathers it looks darker black. I know the white wing feathers will go away like Australorps do. Its feathers look like dark, dark charcoal gray with black lacing