After close listening, I can inform you the lyrics of both versions are identical, the Serendipity Singers however did change slightly the chorus' melody, which is an improvement in my opinion and makes it a more memorable song. But fact remains, at the time this was a big hit in 1964, the song was already nearly four years old, hidden on a rather unknown album ... thanks for your essential offering, mr Offer on behalf of all at www.originals.be where this song was recently discussed. Regards.