Goes beyond them using the same type of magic, they actually do the same thing.
It doesn't help that Blizzard themselves stated that they used the Necromancer hero concept to develop the Death Knight, and then in turn used the Death Knight concept to create their Necromancer concept in D3.
- - - Updated - - -
How could the Tinker not fit Warcraft lore when its mentioned by multiple WoW NPCs within the actual game? Hell, we have Goblins AND Gnomes running around in mecha suits already.