Curt from The Groovy Age of Horror explains the difference of Lucifera and Vampirella on this post with images of Lucifera covers and more images. He also suggests this Lucifera (heroine of Italian adult "fumetti" of the seventies) dedicated site. BTW, almost all the fumetti images are NSFW.

Update: I change the image because Curt doesn't like that cover. Is it better now Curt?