It's the exception rather than the rule that we find two different oaths like these in a service file. One was usually signed at Louisville KY, the opther at either Chattanooga or Nashville TN. I don't know why.
We should picture clerks processing long lines of former Confederates and making notes on a ledger. It wouldn't be surprising to learn that the information on service file cards came from ledgers or rolls that in turn had been transcribed from original records made on site. If so, it's easy to copy some information from the wrong line. That might give us one man's name coupled with the physical description of another man.