[quote=@Moonman]
If I may offer my thoughts on the matter.

Dracula has been depicted differently in certain materials even when summoned as the same class (see: Extra Drac as opposed to Apocrypha Drac), so variants of Servants seem to be within the realm of possibility. 
[/quote]

That's because Romania summon vs non-Romania summon. Vlad's explicitly stated to be special like that.