Yes, you can switch between the three aspirations. You can even switch to other aspirations. The counters for Master Vampire and Good Vampire continue to run even when the aspirations are not active.
The one thing to watch out for is the counter for days survived in Master Vampire. There was a bug where that counter would reset to zero whenever the vampire, or any other member of the household, traveled to another lot. I think that bug has been fixed, but I haven't tested it recently, so I don't know for sure.
Master Vampire Survival Days reset on travel/reloading game
