the acoustic grand piano in both the 130 and 330 are exactly the same however there are more variations of the piano in the 330. None of the Casio pianos can come even close to the styles and acoustic instruments in the roland BK6m. I have both Casio pianos and the Roland module in my store and can assure you I have heard all these and the Roland styles and sounds are far better. The piano sounds are very good in all 3 but I'm talking about the styles, sounds and drums.