On mine I find 001 noticeably, but only slightly, brighter than 003. But I am using i-Loud speakers.
I also find 001 generally not bright enough for my taste, and I often use 002.
But I have also saved registrations where I layered 001 with 002 or a stage piano (004) which is very bright. I use layer balance on a knob to mix in a bit of brighter piano with the 001 piano.
Of course you can always tweak the EQ on 001, which I haven't tried yet.
BTW I have the px-S3000, I don't know if you have the px-S1000, and you might not have access to the features I have.
In any case, there are a lot of pianos in there!