Charley - no doubt about it! These are closely related songs. 'Pearl Diver' (superbly sung, incidentally, Charley) has a similar but much more subtle tune which, of course, was designed to suit a pit orchestra, rather than a folk voice. My instinct tells met that 'Pearl Diver' is not a parody but probably an earlier song that has that has had the 'Rich Man' chorus neatly glued to it.   'Diver' must surely exist in other, fuller versions?

I have long suspected Weston and Lee of adopting and refurbishing songs already in oral tradition. Proof may be hard to come by.