to avoid a style conversion software you would have to record every intro, fill, variation and ending of a single style in C major and save a midi file on the tyros, then sequencer to composer convert each section to its respective slot in the KN7000 composer. However if the style involved mega voice or higher bank drums a large amount of step editing would be required in addition to the normal editing needed to make a style from one manufacturer sound good on another manufacturers machine.
As far as the KN6000 style is concerned there is no reason why it should not work if the OTP settings were saved in panel memories. In fact I have already done that particular style and it is still available for free download at
http://www.technicskn7000.com/home.asp Register, go to the stylist reprise page and download the mellow glamour style on page 2 of the kn6500 section.
There are a further 726 other free styles for your 7k to download