I'm not a Suntour expert by any means, but I don't think that components branded "Superbe" and "Superbe Pro" were marketed simultaneously. I think that it was probably just adding a bit of glam to the line. Superbe Pro was the latter years of production, while plain old Superbe was from the earlier ones. Their designs, at least appearance-wise, evolved quite a bit, but Shimano and even Campagnolo were doing this too in the 80s. In choosing Superbe stuff, I'd recommend choosing which year or two you want to use, and get stuff from relatively the same period; otherwise it will look mismatched. Function is supposed to be very good for the Suntour line -- some people even prefer Cyclone to Superbe, and it's almost always more affordable.