I wouldn't know, but I would guess that Vampira's and Elvira's acts and characters were very different, right? That sort of valley-girl Elvira parodied didn't exist in the 50s...
Anyway, those images of Ms. N from Plan 9 are genuinely creepy, and the badness/strangeness of Plan 9 is even a bit creepy in itself, so (if you're like me, and who isn't??!!) the Plan 9 experience will not be a wasted one. Remember, this isn't a quickie shlock movie from some guy who just wanted to make a few bucks; Ed Wood believed in these films. You're entering his mental landscape.
Thanks, everyone, for making me want to see/hear more of Vampira, now that I can't.....