I've done that on several occasions before. But briefly, the Pa900 styles sound more live, and it has great vocal harmony, has great Songbook feature, has joystick, has superb keybed, handles text files better, has aftertouch, has free updates from time to time, will accept midi foot controller easily, has large color touch screen, and other features that are important to me. However, they and those mentioned, may not be as important to you.
And, I must add, the 950 has excellent lead sounds, particularly lead guitars. I have had to dig to find comparable guitars for the Korg, but they are there and I'm happy with them now.
Nothing wrong with either keyboard. I just prefer what I have now to what I used to have!