If you examine the pictures closely you will notice that on the .45 ACP revolver, the space between rear of cylinder and recoil shield is noticeably larger. Also, the cylinder locking notches are closer to the end of the cylinder than on the .45 Colt version.
The earliest .45 Colt versions (including, I believe the -3 model) used the shorter .45 ACP length cylinder as evident by the longer barrel stub ("forcing cone") in front of the cylinder. All later .45 Colt models used the longer .44 Magnum length cylinders, as evident by the shorter barrel stub.
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