yeah it's the same engine but obviously engineered differently. It might have higher compression and thus require the premium fuel.
At any rate, you don't need to use premium, as your engine management system will compensate for the lower octane by retarding your ignition timing---but you are going to lose the very performance gains that the engineers put into it. So if you can live with less power, and possibly a small drop in MPG, then that's your choice. You have to balance losses with gains and possible mpg loss (or maybe not much of a loss---I can't predict) and make your decision.
Maybe a mid-range fuel is the best compromise.