Are unpacked request table filenames unique

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Once the Canvas CLI has downloaded the gz files for the requests table, there is an alphanumeric identifier appended to each file name. I'm working on a way to shorten our data load time on the requests table into our local db. Can I rely on the alphanumeric value appended to the filename to be universally unique and not ever repeated for a file containing different data? If so, I will use the filename as a primary key/unique constraint to tell me which files I have already successfully loaded.

For example with a file named requests-00000-9b157498.gz, is 9b157498 ever going to be repeated for the requests gz file for a completely different set of data? I know I'll see the same file for a few weeks during the download window but will it be used for a different gz file say in a year or two?