Idk how he's doing now, but pre-draft Nemec would launch wrist shots 80%+ of the time the puck came to him in the OZone, even on the PP. Luke will attempt to move laterally or spin off pressure while Nemec wants the puck off his stick asap. He doesn't have a cannon of a shot and likely won't be a one timer option, however his wristers do often make their way to the net. I did see Nemec make two fantastic, unexpected backdoor passes across seven games as well, so he does show solid OZone vision. I'm sure the Devils are going to give Nemec a ton of PP time with a focus on being a quick distributor of pucks, rather than potentially driving lanes and navigating the OZone like Luke would. Nemec should be a steady PP QB while Luke will be more volatile.
As for 5-on-5, Luke will rush with the puck while Nemec will join the rush without. I see Nemec being a fantastic trailing defender. That Severson goal against EDM is precisely what I see Nemec doing often. Nemec isn't going to get as many even strength points as Luke, but he will be sufficient at making first passes out of his zone and scoring goals off 3-on-2s.