No it is not. The EXB-Dual MP3 card on the PA800 will not fit and would not work even if you did. I have been looking for one (an EXB-MP3) for a couple of years now with no success.

The card was banned in Europe/UK as it contains substances that are no longer allowed in the EU...it is why the production ceased so quickly (relatively speaking) after the PA1x was released.