I think they are different recordings of the same song.

In Grand Bosco, he says Si tu me voir 'pres marcher gone a Grand Bosco.

In It Happened to Me, he says Si tu me voir 'pres marcher au long du chemin d'fer. He doesn't mention Bosco at all.

In Grand Bosco, it's after verse one that he tells the fiddle to take it. In It Happened to Me, it's after the third verse.

Most bands you hear today mix up the two sets of lyrics very happily. They are very close.