They play the A Part four times through the first time, rather than the typical two times through.
Going into the B Part from the A Part, both times, they add an extra half bar, as either:
"[M:9/8] EFE D3- D3", or, "[M:9/8] EFE D3 z3". Have removed this one bar of 9/8 in X1, which works well too.
The first few bars of the B Part bears a close resemblance to the Newfoundland variant of "This Is my Love, Do You Like Her?", known as "Pussycat Up In The Plum Tree" (e.g., https://thesession.org/tunes/6#setting33237 ), then loops back into a similar melody as the A Part of Feller From Fortune.
And in the B Part, some of the held notes can be held longer, and some of them could be split into two. Either works, have just put it closer to Great Big Sea’s setting here in X1. For example, the first bar works as "e3 edB", and the second bar works as "d2d e2B" (or "d2d e2e").