Hi,
a few years back, there was another series of disks that Yamaha had, for the Disklavier ( acoustic midi piano), mainly piano solo's ie classical, jazz & star performers like Chick Corea etc. Some also had orchestral backing. From memory, these were not fully compatible with the Disk Orchestra disks.
Unfortunately I don't have them anymore, so I can't try them to see if they work.

If they're the Disk Orchestra Disks, they work in the Yamaha 9000 pro & also the Technic KN7000.

best wishes
Rikki