There is a new sound-set on the website for the Supernova II but there isn't one for the Supernova

Most of the OS2 Supernova II programs will work in a Supernova. The Performances and drum banks should NOT be loaded. The complete OS2 sound-set can be found in the user area of the Novation website.

http://www.novationmusic.com/downloads.asp?productid=22&type=2