As already indicated, the text appears to be Motherwell's example (Child's example F, from a Miss Stevenson rather than Stephenson) though altered in some places. Only someone with access to Rod Paterson's arrangement would know precisely what changes he has made.

The Spiers/Boden arrangement is much closer to Motherwell, though "I'd fire it o'er that light-brown heart" is a rather odd substitution for "I'd shoot a dart at thy proud heart". I wonder where they got it from?

I haven't heard that recording either, but the doubling-up of verses might indicate that they've used the second tune Motherwell printed.