I scanned the descriptions of these two keyboards and it seemed that they basically had the same features (such as number of different instrument sounds, touch-response, and pholyphony)...I couldn't spot any differences in the descriptions...If I were you I would read both descriptions very carefully just for your peace of mind...sometimes Yamaha keyboards are very similar (eventhough the model numbers are different)...evidently both of these models are fairly modern since they are both currently on Yamaha's website...I would consider buying the least expensive one (I therorize that one of these models is being replaced by the other and Yamaha is just getting rid of inventory...but that is just my theory)