Thanks Brad.
For the px5s I am using the 0-0 Concert grand setting, and for the px560m I am using the Grans piano button settin which gives 001 GrPnoConcert as the tone.
The tone settings for both are factory default I believe, unless there is anything different in the ALTERNATE stage settings from a download from Mike which I loaded into the PX5S.
I am using the speakers on the PX560M (which sound really good I think). On the px5s, I have tried a few different speaker setups, none of which seem to give the lovely tones of the PX560M, but they have mostly been relatively inexpensive PA speakers and maybe not designed for a keyboard setup. (Ricco model T2016 stereo powered speakers sitting on a shelf above the keyboard about ear height, or a QTX QX12PA powered speaker for a mono setup to get better bass.)
If you are saying that the sounds/samples should essentially be the same, then it looks like I just need to invest in a better amp/speaker setup for the px5s. Any recommendations?