“Tin cans” today are very rarely tin at all; even when they were, they were steel cans coated with tin to inhibit corrosion. Steel cans today contain various coatings (sometimes, organic tin compounds) to reduce corrosion or to protect the contents in other ways. Different manufacturers will have different alloys and compounds that they use, but most “tin cans” are mostly steel.
Except for the aluminum ones, of course; most of them are aluminum-magnesium alloys, and there is more magnesium in the tops and bottoms of “aluminum” cans than in the body, for strength. Again different manufacturers will probably have slightly different formulas.
So – are they they same? No. But pretty close.
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