Hello Francisco:

The MicroArranger can not play PA500 styles, several reasons, if the style had any parts using the Guitar mode, well, the KMA do not have it, and the structure is different, one thing, the PA 500 CAN play KMA styles, of course, they will be missing one Intro, Ending, the Break, and perhaps some voicing if was use any of the RX, or if was a PA800 style that had some DNC sounds, too.
When I re-did our styles for the MicroArranger, I had to eliminate some parts, and wherever I did use the Guitar Mode, I had to "converted" to a format that was readable for the KMA.
Very much like the styles from a PSR 3000 to a Tyros4, but never from a Tyros4 to a PSR3000.
You get the idea.

Manuel