You could be right. I'm damned if I can remember how the second half goes, and I'm too lazy to pull the Keane Sisters record out of the stack and play it. However, I will aver that their tune is longer than that of TRC, so Bert presumably reduced it.

Also, the connection has been made elsewhere in print. I think Roy Palmer mentions it in Singer, Song and Scholar. Plus, I think I recall Eric Winter spotting it when he reviewed the Keane Sisters record back in the early 70s.

Sorry to be so vague but it's not yet mid-morning and I'm still only on my first cup of coffee.