I wouldnt call Thuas ag Gort a' Charnáin an entirely different song because as well as sharing a tune with Cuachín Ghleann Neifin it shares a few verses and both songs mention the place Carnan. I'd say they are variants of the same song.- see two versions of lyrics shared from Daltaí na Gaeilge discussion boards Thuas ag Gort a' Charnáin on Mudcat

do any of these verses help with the Máire Ní Scolaí recording?