Curiously different firmware hashes on c7-v5

I have several TP Link c7-v5 routers running 21.02.3. Interesting this firmware file is different on different routers. Some have been installed using the factory 21.02.3 image and some have evolved there using sysupgrade.

Just curious if anyone else has noticed this.

M

fa173c07a4b870b622d97729309722d48aa5163fe09327f930ab8f4bfdde28c6  /lib/firmware/ath10k/cal-pci-0000:00:00.0.bin
1a5a7490e7b17da9ae03a559d699737618105e2077fede4cbf6d14c17764fb5a  /lib/firmware/ath10k/cal-pci-0000:00:00.0.bin
28ddfbd530fa80df69575dfb251bbb93a353d53a22224c17e300d2c8b095e9a4  /lib/firmware/ath10k/cal-pci-0000:00:00.0.bin

Aren't those files symlinks to calibration data? Calibration data is device specific.

Apprently no. Not a symlink and only one name points to the file.

root@orangeA:/lib/firmware/ath10k# ls -l /lib/firmware/ath10k/cal-pci-0000:00:00.0.bin
-rw-r--r--    1 root     root          2116 May 25 14:22 /lib/firmware/ath10k/cal-pci-0000:00:00.0.bin