Yes there is a difference in key feel between the two.. The 9000 Pro uses the same keybed from the Yamaha EX-5. It is much sturdier and it has synth action as well... The PSR-9000 key quality if far less than the Pro.
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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.