Gday guys i just bought a 9650 just wondering if i can use the plugs off of the 4650 or will the 9650 need different wires connected?

IIRC pioneer standardised the wiring in the 650 series HU's, tho you should still check both plugs before just plugging it in

Same wiring harness, but it won't have illumination or phone mute in the 4650 plug.
Match the plugs up to see where the wires have to go and use a pop rivet that's been ground down into a point and remove the wires and put them into the old plug.
Hope this helps
Cheers,
Dave.