I have the EVH Stealth and I think the neck profile is a little flatter and the nut seems a little wider. Ever so slightly wider. I have had the PV Wolfs, EVH MM's, and the HP. HP is a killer guitar but after playing on SS frets, I prefer them over nickel frets now. I can't get away from that silky buttery feeling when playing them. I think I used to dig the neck profile a little bit more on the PV Wolf and HP, but that's because I have sausage links for fingers. The EVH MM is way to narrow, but the PV's felt just right. They seem to just fit in your hand perfectly. I am used to my EVH Wolf now and have no problem going to and from either. Actually preferring the "wider" feel of the nut width.
To me, the aforementioned are the differences in the necks I feel.