Ah, yes. Having another look at the brochure it does seem to show the larger 17" wheels on the larger engine but the width does vary on all the engines, regardless of power output.
The overall diameter of tyre + wheel is going to be the same soI guess the only difference would be a slightly firmer ride.
The only thing I would say is that you may have to advise your insurance company as they will probably see this as a modification.