I cant speak of the exact model but the Buccaneers as I recall had taller topsides than the US line. I'm betting this is where the weight difference is. Keep in mind those weights are "average" as with all boats and can vary as much as 20% within the production. The buccs and bayliners may have been the same hulls but the layouts and decks were different. As also said the topsides were taller on the older models.
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Hull #68 S2 7.9 on our little landlocked puddle, Lake Wallenpaupack, PA, it's cheap, trailerable, and paid for.