GSX750S Frame

OK here's a question more aimed at our Japanese members. 3 years ago I renovated my low kilometer Japanese domestic market Katana 750. When I painted the frame I noticed how light it felt, I had a CB750K2 frame being painted at the same time and I know they are completely different but none the less similar in size, the Kat frame felt half the weight of the Honda. Fast forward to now and I have an Australian delivered Kat. 750 frame and I'll guarantee it's a lot heavier than the one I did previously. Does anyone know(no guess's please) if the Japanese models were made from different metal? I cannot believe that smaller wall construction would make that much difference. When the latest one's together I could take the tanks off and run them across some scales. Any clues!
 
I've heard on one occasion that the pipes of 750 frame are thinner than the 1100 frame despite its same size. But I myself have never verified it, though. This is all what I know about the weight of 750 frames in Japanese domestic market.
 
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