Personally I'm very suspicious of all versions of Twa Magicians, and I'm glad to see you are putting Hares on the Mountains in an appendix as both could at a stretch derive from continental versions independently.

KJ
You have the MacNally version from Maine but there are 3 other versions in Flanders, Ancient Ballads.

There's a pre 1850s version in the Stevens Douglass Manuscript.

There are 2 prose versions in MacEdward Leach 'Lower Labrador Coast

And Niles gives a version from Ratliff which doesn't seem to have suffered much at his hands.