I've added a little blurb to explain the car to an American audience, but in stating that no body parts interchange I then wondered... do the trunk lids perhaps interchange?
The tail lights do, so it's possible... does anyone know?
For your 69, I'd say the trunk lid and front & rear bumpers, as well as possibly the front and rear valances. I'd think the doors would interchange. I know the hoods are different as 69 American Pontiac's had the opposing wiper setup and the hood is cut around them. That changed in 70.
The stamping always looks "crisper" on the US rear fenders, so I was always curious about the doors, even if they physically fit, would they look right.