My understanding was the Sorrento was a more optioned model. I had a 1987 S-24 Sorrento. It was a 23' 8" cuddy cabin boat. It came with goodies that were options in the standard cuddies. There was also a 25' Sorrento which was like a 25' Sundancer but with more standard features, better upholstery, etc.
You could go to www.searay.com and the archive section would give you more detail if you want.