Jim K is quite right, the .38 S&W can be turned into the 9mm Federal. I've got a few of those 'converted' rounds lying around somewhere.
But not so the .38 S&W Special. The case diameter is not the same as that of the .38 S&W.
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If you see a step machined into them, then 9mm will probably headspace and fire correctly.
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Does not every centerfire revolver have a step inside the cylinder? This is because the bullets fit inside the case and hence there is a step where the case ends and the exposed bullet begins.
Bart Noir