Saved presentation is smaller on my internal drive than on my external disk

This is not a big deal and it does not affect the use or effectiveness of Keynote, but I am curious. If I save a presentation on my internal drive it has a smaller file size than if I move it to my external disk. Can someone tell me why?
Thank you

Different disks and disk formats have different allocation block sizes; except for zero-byte files, each file needs to occupy at least one block. For this reason, some space is wasted on a disk, and the larger the disk is, the more space will be lost. Using the Mac OS Standard format for a disk causes much more space to be lost compared to Mac OS Extended.
When a package is placed on a drive, each item in the package counts as a separate file. Creating a disk image with the Disk Utility in the /Applications/Utilities/ folder and storing files on it will reduce the amount of lost space.

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