Yeah the GTT is defenetly a more modern look and would appeal more to young people (i.e. not me...) but they are big time different in terms of conception:

The 5 GT Turbo is front engined and had a 1.4 turbo (carburetted for the early ones) developing 125 bhp (if I'm not mistaken) and driving the front wheels (spinning them though a very approximate front suspension set up would be a more appropriate term in fact).

The Turbo (and Turbo 2) were mid-engined 2 seaters with a 1.4 Turbo (always injected - no carbs) developing 160 bhp (standard) and driving the rear wheels through a superbly engineered (dual wishbone at each corner) suspension.

Very different animals. Only the badge was the same.

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Ha, babyboom beat me to it...