They're both 61 keys though. for 88 keys you might want something like the CT-SP110, good value, fully weighted hammer action keys. Or the px1100, but at px1100 price, also consider the Roland fp 10x / fp 30x whiich have better sound and key actions. (I did a few months of research, got the px1100, kinda regretted not getting the 30x instead, but I love Casio's textured keys, they worked great with my sweaty fingers.)