32mm would make it Hero scale. It'd be about the same size as the Dark Vlad miniature which I know several other members of the forum have. Having painted a few from Enigma, the scale is different but not massively so. Unless of course they're supposed to be 'human' and then they just look plain silly. That said, Vampires could be greater in size than a human so 32mm would nicely show that. Most GW stuff is between 28mm and 30mm anyway.
Maybe other members could post photos of their Dark Vlads next to standard GW core to give you an idea?
Alternatively the difference between standard GW fantasy models and LotR is about the same as GW and Enigma (only GW in this case would be LotR and Enigma would GW Fantasy). That sounds really confusing but I don't really know how else to word it. Hope you get what I mean anyway...
Cheers,
u_m