In fact I dont know if the Import of Audya styles will be possible on SD9...
But, to clear the differences between SD7 and SD 40: I think, the advantage of SD 40 is the different soundboard, which makes the selection of styles and registrations much faster. If you need more storage or DJ functions, the Midjay Pro will be the better choose. The SD40 is dedicated to the accordeon players, or as addition for present keyboards or digital pianos. I will use it with accordeon and an old digital piano, and therefore it is made perfectly in my opinion.