If you go to the School of Scottish Studies etc. tapes, you will find recordings of the Gaelic version that supposedly spawned the 'Eriskay Love Lilt. This is an on-line archive that you can listen to.   I don't hear much of the Kennedy-Fraser tune in the unaccompanied Gaelic recordings they cite.   Kennedy-Fraser is supposed to have heard it about 1910, being sung by a young girl. Perhaps she caught on to something and altered it in memory.   The site is called 'Kist o' Riches'.