What's the difference between 380 ACP and 380 Auto...

About all a miss will likely cause is a ringing in the ears and possibly tracks in somebody’s drawers! There an be other reactions, of course. And it is also true that hits occur without much if any visible reaction seen, at least for a short time.

Both description posted by the OP describe the same cartridge.
 
Where do I find them .45 Auto cartridges? All I can find online and at the LGS are .45 ACP cartridges . . .

You must have not looked very hard. Here are some pictures of both factory boxes and pages from Sierra and Hornady reloading manuals. Note the description in the Hornady manual.
 

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Where do I find them .45 Auto cartridges? All I can find online and at the LGS are .45 ACP cartridges . . .

You made that up.

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