The polar pattern, yes, but another characteristic of a super-cardioid mic allows sound to enter from directly behind the mic. This may not be an issue with keyboard players, but if you have a monitor speaker directly in front of you - you are asking for feedback. The up side is that the 945 rejects more sound from the sides than the 835 (which I use, too)
I have way too many mics, but I like having different colors in my crayon box.