They share the same driver..The 702 are black with a detachable cable. But some 701/702 owners claim they sound different. I'd PM ACIX.. He is a huge 702 fan & can link you to a thread where a person A/B both 701/702. I only owned the 701. Very good for large orchestra performances.. With a slight layer of warmth on acoustic instruments..
I think I'll end up taking my rig into for a listening party with his 701.