The guts (slides, [bigger softer] springs, and spring tops) of a Malossi are quite different, as well as the obvious differences on the outside (plunger chokes, pumps removed and blanked, and big bellmouths added). Many do not have idle speed adjustment screws. Here are a few shots of a good example:
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Malossi 42mm ei.jpg [ 54.06 KiB | Viewed 1002 times ]
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Malossi 42mm ed.jpg [ 52.03 KiB | Viewed 1002 times ]
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Malossi 42mm ef.jpg [ 53.44 KiB | Viewed 1002 times ]
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Malossi 42mm ea.jpg [ 54.65 KiB | Viewed 1002 times ]