The same prop or the same character?
It might indeed just be a random, leftover prop from TPM. But either way, if it just remains an un-named background droid in ‘Rogue One’, I guess we can choose to believe it’s the same one if we wish.
Anyway, here’s the actual link I came across which brought it to my attention - jalopnik.com/this-is-the-first-positive-identification-of-a-known-dr-1771219814