The Devil and the Feathery Wife is a close rewrite of The Politick Wife. Buchan only has 12 verses. There is no v2. Verses 7&9 are substantially rewritten to become 2 new verses rejigging the lines and missing some out. Verse 12 is expanded into 2 verses. There is no verse 14 or 15 or 17. In my opinion this is Buchan's handywork.

If you check Bert's version and it has any of the elements of the verses missing from Buchan then the broadside was the more likely source. Simple!