The FZ6R is a different bike to the FZ6. It's heavier, has less power but is generally easier to ride with a smoother clutch and broader power band. There is an FZ6R forum to check out.
You should have an experienced mechanic or bike shop look it over to check for among other things bent forks, frame damage, subframe, swing arm.
You could get a low miles FZ6 for just a few hundred $ more that isn't smashed up.