There is no changelog for Netgate Coreboot Upgrade package, the git history is what you are after. Github link below can be slow sometimes due to the size of the repository but it nearly always loads here for me.
Try looking at the history of the Makefile for the port instead: https://github.com/pfsense/FreeBSD-ports/commits/devel/sysutils/pfSense-pkg-Netgate_Coreboot_Upgrade/Makefile
Is this just a numbers matchup??
No, one has nothing to do with other.
h, BTW, the netgate bios update procedure page https://www.netgate.com/docs/pfsense/sg-4860/adi-bios-flash.html still shows version 12,
And the bios page at https://firmware.netgate.com/bios/ does not have the current 01.00.00.17 firmware
If you are not going to keep these pages current… could someone at least point the owners to the github site for the latest firmware.
https://github.com/ADIEngineering/adi_coreboot_public/tree/master/releases
That's bootable upgrade image, not the same as the package. Always use the package as this method provides the latest BIOS upgrades.