It's actually a common misconception, even among life long shooters that a .380 is a "9mm short". Not the case. Now a 9mm Kurtz/Makarov is actually a 9mm short, but that is the only one that I'm aware of.
You may, if the manufacturer of the dies has them designed that way, be able to use .38 Super and .380 on the same die set, but I cannot state with any veracity if any manufacturer makes dies that will do both, or if the two rounds have enough common dimensions to even allow it.
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