The file format is different due to the new operating system platform. So whilst you can take Audya styles (midi based) and convert them right on the Midjay pro...unfortunately you cant go the other way...and neither would you want to:
The Audyas audio styles are far superior in quality and size to Midjay pro and SD7. Audya benefits from low compression, long loops for drums/percussion, plus audio guitars.
...just to add, the audya has over 700 styles on board out of the box, with several hundred additional styles avaiable both free of charge and available to be purchased from Ketron. You also have a HUGE library of style elements that can be mixed and matched to create new user styles as well as on board style writing/editing.