What to do with this? Is there need for two different tags here or should the two of them be synonymised?
"Dependency" does seem to be mostly associated with "dependency grammar", and most of the dependency tagged questions do seem to be about DG, so a tag merge makes sense.
One exception to that generalisation is "dependent-marking languages" (as compared to head-marking languages). That's a typological term that gets used by constituency grammars. But it probably doesn't need its own tag.