They actually have pretty much identical testing numbers with Nkem weighing about 15 pounds more. Both top recruits that were a bit disappointing in college. I think you play them in identical roles in the pros, out at end on run downs and slide them into DT on passing downs cause they'd get crushed as full time DTs, but the NFL is leaning towards versatile DLs these days. Don't think either are regular double digit sack guys but keep the expectations reasonable and put them on a team with another real pass rushing threat (like the Raiders with Mack) and that's way more valuable than a 320 pound DT that can't push the pocket at all.

Of course Nkemdiche has more risk that he'll do something ridiculous off field since he has a history of it before but he could be a good chess piece under the right coach.