I'm maybe totally wrong here, but when save sequensed songs at the Tyros
or PSR, it's saved as midifile, GM or XG, right?
If so, save one of each format, load as GM into KN7000 and to get use of
most sounds on the KN, save as NX to coninue your playback / work and to
see which of the GM or XG who give the best result as startfile.

But again, I'm not that familiar to the keyboard models you mention, so
maybe a post at the Technics Forum would be a good idea?

Good luck
GJ