Yes i know i don't have to update to the latest but say someone wanted to for wtv reason , how would one know which one to take short of trial and error .
Well it is a trial and error if you don't know what exactly the firmware installed before you can start flashing it with the 2nd one which is this ANTMINER-S19-release-202111161922.bmu
If you have some issue experience then repeat the procedure flash it again with recovery and then flash it with the first one "ANTMINER-S19-merge-release-20211216091201-8IN1.bmu"
Then test it again.
Ya that's what i been doing , was just wondering if there was a way to differentiate them to avoid that process