The main things were the graphics, gauge package, and controls and interior panels.
The SST had color matched gauges, the standard Livorsi controls and the standard dash panels and glove box cover while the 35th Anniversary had the chrome bezel gauges, billet Livorsi controls and the carbon fiber look dash panels and glove box cover.
Here is a Picasa link to my old 35th when I had it for sale, it has several pictures in and around the boat you can use for comparison. Some things I added like the chrome vents and stainless cup holders.
http://picasaweb.google.com/haulinvols/Baja25Outlaw#