Bootlid does not fit 100%.
The 3200 bootlid looks very handmade to be honest.
If you delete all the paint, you will find odd copper weldspots.
I think the 3200 bootlid was matched to the body where it was placed in.
The 4200 bootlid looks much more like a massproduction part.
It is allmost certain that you will have to do some bodywork on the 3200 bootlid to get it fit perfectly.
There is very little room for error, because the slightest mismatch is clearly visable at the 3200 rearend.