No, they are not the same, no they are not totally unrelated. They're like cousins who don't talk to each other anymore. To an extent, they both share a parent, (or maybe an 'uncle') Aleister Crowley. Both have another parent who is unrelated. (in Wicca, it's traditional Cunning Man/Woman tradition, in Satanism it's the Hellfire Clubs that every Ben Franklin-style aristocrat was in) So, the power of the Individual's Will is emphasized in modern Satanism, and 'An it Harm none, do what you Will' is the central tenet of Wicca... Will is the emphasis of Crowley, and his legacy. But, they haven't been the same, ever. They are different in their approach, in their focus, and in their ultimate goals. There is no "Satan" in Wicca, but just as Wiccan reclaim the title "Witch" and turn it positive, Satanists reclaim their own title from Christian mythology.