Yup, wagon is different than the other body styles. Typical of most SW's is that the lenses are held in by screws from the outside, whereas the other body styles have lenses that attach from the back side, studs on the housing and take nuts from the inside of the trunk to fasten them to the body. They're similar in appearance, but, nothing interchanges.
Years ago I had a conversation with a friend and he posited an idea: By production numbers, some ABC body wagon parts are possibly even more rare than the same parts for sedan and coupe models.