I just read through all these messages again. I'm at a disadvantage because I'm not familiar with the Korg machines. But I went here:
http://www.korgpa.com/pa_root/en/products/pa500loc_info.html?en

What I get this time is that these 500's are all physically exactly the same....with the same sound engine?

The Musikant has different dance styles than the American version?

This USB Musikant stick...
http://www.musik-produktiv.de/korg-musikant-usb-stick.aspx

...has all these different sounds/styles contained in it and plugs into the USB port on the PA2xPRO (but not on the 500)?

I mentioned I called Korg but they know nothing about it.....and, I might add, couldn't give two hoots anyway.

Lucky