Nothing, .45 auto is just another name for .45ACP.
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.45 auto and .45ACP are the same round.
There is no difference. ACP stands for Automatic Colt Pistol.
No. 45 ACP is approximately 11.5 millimeters, so 10mm is slightly smaller in diameter.
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To indicate the caliber and manufacturer, or specific type of cartridge. For example: .22LR means 22 long rifle, which is different that a .22 short. .40 S&W means .40 Smith and Wesson, etc. which is different than a 10mm, even though a 10mm is .40 inches in diameter. .45 ACP stands for .45 Automatic Colt Pistol, which is different than .45 GAP, which stands for .45 Glock Auto Pistol.