Traditionally, the two are the same, with just a different alignment.
Oh, and in Christian faith, devoid of physical form, but we're not gonna get into that.
I mean, almost no mythical creatures/races have been held to authentically here, so why should anyone but me start now?
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)