Not in our area; nor am I aware of any place actively running both in the same class. As I recall regarding IMPBA (speaking Nitro) cat's run in the hydro class not in the outboard class.
interesting topic... I can tell you this, my FE P-LTD VS-1 tunnel is pretty fast, but I would get my Ar$$ handed to me with a reasonably set up RTR P-LTD catamaran.
Later,
Mike