Two different sizes. .32 is .320 inches in diameter, .380 is, well, .380. There are different .32 cartridges for revolvers and automatic pistols, the .380 is for automatic pistols. The .380 also has more power than a .32 auto.
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Two different sizes, and the .32 ACP is a semi-rimmed cartridge, whereas the .380 ACP is rimless.