Sunny,
I agree with UD... Both keyboards have their good and weak points, but the KN-6000 is very nice arranger.. You'll have more sequencing power in the KN-6000, better speakers, color screen, aftertouch, and a few other things.. Both would compliment eachother rather nicely in a mix..
_________________________
GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.