I'm not sure that the 'Floral dance song' does incorporate the Furry dance tune. Doesn't it use the tune for the Truro song, John Bon? The one on page 11 of Gundry's book Canow Kernow.
All I know is that down here in Helston we have never forgiven Terry Wogan for that horrible song!
The short answer to your question John is that they have bu!!"* all in common. One is associated with a traditional event in Cornwall the other is commercial rubbish (a personal opinion).