There was a transition time when they went from plywood to poured, we just can't give you an exact date/year. My '92 230 Explorer may or may not have a poured transom but it does have wood upper wings. By '96 I would think they all had poured transoms - depend on what Genmar was using for their lineup.
You can tap on the transom with a socket or pound on it with a rubber mallet. The Euro transom in '96 has all the "Euro" stuff in the back in front of the actual transom.
Only way to tell for sure is take an engine mounting bolt out and dig around in the hole.