Wow – identical indeed, even the rhythm switch in the middle. Nothing wrong with that - Dylan does it all the time - as long as you give credit where credit is due. Which I'm sure Mark would do, like he did with Miss You Blues or Oklahoma Ponies, if this song should end up on an album. Hearing this now, thought, I doubt it will. Maybe as a bonus track.
Personally, I love song traditions being carried on like this – but only because I know that Mark can deliver original stuff, too. As long as I get both, I'll be happy.