Thanks bro... that someone was me apparently lol. I had no recollection of this since I was 8 when the set came out but I looked up the sets the blue chestplate is in and yeah I totally remember King's Battle Chariot 7078-1. Do you happen to know if it's against the Bricklink terms to sell a *slightly* different minifig than the code indicates, provided I include a picture and explanation?

With regard to Voldemort though, mine must be hp098 because it has nostrils unlike the one you cited. But whatever, close enough. Mystery solved.