The transmission seems to be carried over apart from the addition of the manual change facility. I reckon that a whole lot of little parts you don't see, things like electric window motors and so on, would be carried over too.
But Ford has mostly spent its dollars wisely.
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S