It's my favourite song to perform. Must admit I've never seen the words you posted. The late great Luke Kelly brought it to Ireland after being thought it at a Wolverhampton Folk club circa 1967 and always described it as of 'Scottish Origin' and though many in Ireland now regard it as an Irish song, it does have a distinct Scot's flavour to it. It may well have ravelled to Nova Scotia as many Scot's Trad songs did. And as Carrickfergus is believed to come from the late 60's it's possible it took some of it's words from the version you posted not vice versa