Well, the term "Mazoku" is actually a generic, meaning "demon(ic)" "tribe/clan/family", and can be applied to a broad variety of beings; the Slayers variety aren't at all prototypical of the concept. (F'rinstance, in Dragonball and the relevant filler arc of DBZ, Piccolo-daimaou and 'Garlic Junior' are referred to as Mazoku.)
Doesn't mean you can't do something with the correlation anyway, but it does cut down on the obviousness and awesomeness of it to some degree.
Doesn't mean you can't do something with the correlation anyway, but it does cut down on the obviousness and awesomeness of it to some degree.