There's more background on this thread but you'll find a lot more discussion in several of the threads up top.
I believe the words from GUESTLaurent are the words the Watersons rewrote but the thread above has them the way they are sung in Helston.
There is a definite difference between the two versions and they don't work together. If you go to Helston, don't try to sing the Waterson version!
Robyn