How can the current be Cyrodillic when the Cyrodiil disease was called Porphyric Hemophilia but in Skyrim its called Sanguinare Vampiris so they would have to be a different. Not to mention the vampires in general are different.
I believe the Vampires that we already have integrated into the game are just the Cyrodiilic type, and that the new DLC ones are the Volkihar.
I think the only reason the ones in Skyrim are different from the ones in Oblivion (As in, instead of sun damage, we have decreased stats, non-regenerative magicka, health and stamina, ect.) is because people complained about them in Oblivion. I believe they're the same strain of Vampire in Skyrim as they are in Oblivion, it's just they made the game a little easier for people.
The new DLC vampires for instance have different eye colouration, they can actually transform into a Vampire Lord (a completely new form), plus, they also have the ability to transform into a cloud of Mist like the Volkihar are supposed to be able to do. So in a way, that right there is evidence that the vampires we have now are not Volkihar.
Perhaps they're just Cyrodiilic Skyrim Vampires. Exactly the same as the Cyrodiilic ones, but they have minor changes due to them evolving in Skyrim. Different climate and all...
