I would not trade for Hunt, especially like you say RBs are interchangeable for the most part, and Barkley’s injury is not deemed to be long term.
While I give Breida a lot of credit for that five yard run on the last drive in his first touch after the Barkley injury, I do not think he or any of the other RBs on the roster have the ability to replicate what Barkley do getting that touchdown in the second half.
Of course Barkley also had a second consecutive brain freeze by allowing an easy catch pop off his hands and turn into an interception.