"Extant"
"still in existence; surviving." - what I thought it was
Which makes no difference to its origins - a bit like the Eiffel Tower really. only much, much older
What's your point ?
The fact that some versions have the 'rose and briar' motif and some don't makes neither more correct than the other
The oral tradition expands the songs, never replaces them - they are all out there lurking in the ether somewhere
Jim