There are some. Nothing too drastic though. Some of the windshields are different. Some had stainless frames, the later ones have just plexi with joiners, also some limeted editions like the shelby have a painted windscreen and custom hatch with a scoop. Also The engines on the later ones would be 496's, where as the earlier ones were 454/502's in the 1990's.. There is some other stuff too, but they are the common things.
If you are looking to do something in particular feel free to give me a shout. We are a Factory authorized customizer & restorer. We do a good ammount of Donzi related stuff, just not really much with boat sales..
Jamie / Lakeside Restorations 570-639-2628
.