Hello Razorcar:
The style parts were probably changed to take advantage of the KN7000 new sounds. The main concept is keeping the rhythm (composer). There maybe other reasons, and Technicsplayer can answer that.
Since, the styles are not the same, the only thing I can suggest is find someone who either has a KN3000 and copy it for you, or someone may already have done so and have that person send it.
Hmmmm, has anyone thought of making available on a website a library of past model default settings? That is, take a KN3000 composer and panel memory using MSP and save it in KN3000 format. Then another person would do a KN5000, etc. Before you know it, that site would have a library of all the models styles, and rhythms in its original model format, not converted. Of course some tweaking will be needed if played on different models (newer).
Anthony