Why are there 2 versions of macOS Sequoia available from the OCLP installer?

When I went to create a new macOS installer, I see that there are 2 versions of Sequoia 15.1. They have slightly different version numbers, download sizes and are 2 days apart. Anyone know what the difference is and which one I should use for my 2017 27 inch iMac?

submitted by /u/demann1963
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