The side impact crash requirements got much more stringent between 80 and 200. So I suspect that the doors are much thicker on the 200 than the 80It'd be interesting to see a cross-section of each series wagon, by age, from 80 through 250, cut perpendicular just behind the rear doors.
The 80 had more interior volume but smaller exterior dimensions than the 200. This suggests lost volume to more space between the cabin and body panels; cross sections would reveal those trends, and how and why that space was used.