I think its ridiculous to say the two are the same, if you look at the lyrics and melody, which is what the copyright applies to.
Thomas Friedman wrote, in his book the World is Flat, something along the lines that 1968 was the year that the number of Lawyers exceeded the number of Engineers in the USA, and since then, the USA's position in engineering has decreased globally.
So is 2018 going to be the year that Copyright Lawyers outnumber musicians and songwriters in the music industry (or do they already??) and so lead to the demise of music . . . .
Its ridiculous to say the two are the same, if you look at the lyrics and melody.
Dave