According to MacEdward Leach, the tune "Off She Goes" is the same. Hear it on harmonica on the website "MacEdward Leach and the Songs of Atlantic Canada."
Songs of Atlantic Canada

This website is a project of Memorial University of Newfoundland.

The Digital Archives of the same website, Seldom Come By, have a Video of Melvin Combden playing "Mussels in the Corner" on accordion, two parts, and part of a third from Fogo Island.
Collected in 1975, Maureen Power, Evelyn Osborne.
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See article in "Canadian Folk Music Bulletin,"
www.yorku.ca/cstm/BulletinIndex.doc

Have to leave; perhaps someone will complete this reference.