OK, technically...WHAT IS THE DIFFERENCE....between an Isa Brown, Shaver Red, Golden Comet, and Red Star chicken? I have looked at images of all and they seem the same to me. However, we have six hens that were all originally called "Golden Comets" when we bought them, yet there are slight differences between our three older ones and our three young ones. The three older ones are slightly redder, and they do not have the white "necklace" I guess you'd call it...that the three younger ones do. But they all have the white trim on the tail, and conformation wise, look the same. Help??