Craig, you are right..although when I converted Technics styles, and Korg, to the Roland G1000, they play fine..When I converted the Tyros2 styles to the G1000 they also played fine...except a couple guitar patches[tones]..I had to reduce the velocity by 50%..Maybe they used the SA sounds and needed to be played by the Tyros2[I doubt it though]..

I have found that many converted styles can be adapted to keep my "Old" board fresh enough for me..

The same styles I converted ,that play well in the G1000, did not fair as well in the PSR2100..

The Solton/Ketron styles are hit and miss...Styles that use the guitar[strums etc] do not work well..

My go to styles are pretty much Roland styles[especially the G70 conversions..they work great]..I also use a few Yamaha styles[PSR 9000 and a couple Tyros2...I also like the older Technics KN2000 styles[although they lack the extra variations]..
I also use some Korg i30 styles[mostly dance oriented styles]..