A Barred Rock rooster over either of those hens will give chicks that are black and white barred, probably with red or buff leakage. Leakage means a few feathers of a different color can leak through. This mixed cockerel should be solid black but has some buff leakage.
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There is a lot more to breed than just feather color. Things like eye color, type of comb, number of toes, and many many more. Body shape is an important component of breed. A good poultry judge can tell the breed of many chickens just by seeing a silhouette of that chicken and nothing else. When you cross two breeds you don't get a breed, you get a crossbreed chicken.
Exactly