The Cannondale must be older than 92-93 based on the under-the-top-tube cable stops.
It would be interesting to read a rode test comparo between the two bikes.
In '92 the 2.8 Series frame was introduced on the higher end road models, replacing the 3.0 frame. They are unique as that's the only year the 3.0's rear brake's top tube cable routing was employed for that series. Following years saw the 2.8's top tube rear brake cable moved to the lower LHS of the top tube and the housing became a two piece housing rather than one single run.
What's remarkable about the OP's Cannondale is that it is still in original condition. I'd also like to read about a comparison of the two
Brad