I've heard about Mikunis being hard to jet, and had trouble jetting the one I owned, although I got it used. Plenty of people like them, but I would stick with a Kehin(sp) carb.
But, yes, a Mikuni VM carb should operate about the same, 28mm compared to Kehin(sp)28 mm. Mikuni jet numbers will be way different, much higher numbers than the Kehin(sp), could be into the 300s with the jet sizes, as well as being much easier to spell.