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For example the 9mm bullet is the same as the .38 Special which is actually not a true 38 hundredths...
The .357 magnum is also not a .38 caliber... but it is the same caliber as the 9mm.
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Sorry but that is not remotely correct.
In the first place, the 9mm and the .38 are NOT the same diameter. The 9mm is .355" and the .38 is .357 as is the .357 Magnum.
The .38 got it's name when it actually was very nearly an exact .38 caliber. It began a "heel" type bullet which is the about the same diameter as it's case. like a .22 LR. It evolved in design over the years but the name didn't change.