Heaven & Hell are basically Black Sabbath fronted by Ronnie James Dio rather than Ozzy Osbourne. The lineup was Dio, Tony Iommi
(guitar), Geezer Butler (bass), and Vinny Appice (drums). As far as their fans are concerned, The Devil You Know
represented the first new Sabbath album since 1995's Forbidden
The name change was because when they toured, they didn't play older Sabbath material.