Don't forget NoName and his Costanza moment.
They should be interchangeable. Unless the doc has a boat payment to make.
Put the dog socks on and forgot which leg the "shoe" went on…
A quick glance through google fu and even up to ordering one, didn't reveal a L or R but size options.
https://www.washingtonexaminer.com/john-mccains-walking-boot-mysteriously-appears-to-swap-feet-in-latest-photo
The binding appears to have the same orientation in both of these photos. Achilles tendon injury is what is stated.
On Thursday, Thanksgiving, McCain tweeted an explanation for the swap, saying that his left leg had been "doing extra work to compensate for the boot" so he had been "giving it a break."
>https://www.washingtonexaminer.com/john-mccains-walking-boot-mysteriously-appears-to-swap-feet-in-latest-photo