I'd think the one with copper coloring is a cross...I've seen thousands of Jerseys, and have never seen one with copper hackles. The fact that he's got copper hackles AND saddles tells me he's a cross, too, because typically if you get a "sport" color, it's either solid or hackles only. That's just my experience, though. He's a beautiful roo! He actually reminds me a lot of my copper black marans rooster! If he were mine, I'd find out from the breeder what other breeds he has...ask in a curious way, and you may find he has something that could have put these feathers on in a cross situation. Accidents happen!
If it IS a sport, though, gosh, that's a LOT of copper feathering - would be neat to develop a copper colored Jersey!