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It sounds rather incredible today, but most calibers "just grew." Example: S&W copied the French Flobert .22, then made a .32 when more power was wanted. Meantime, Colt made a .31 caliber percussion revolver and when some were converted to cartridge, it was .32. But they weren't the same .32; competition not permit that. So there is a .32 Colt, and a .32 S&W and they are not the same. Each of these anomalies has a long story. It is fascinating, and would take a book to describe all the ammo names and where they came from.
Jim
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