Noticed something odd while listening to Metallica

So I was riding in to work, listening to a little Metallica, and noticed that James stole lyrics from himself in order to write the theme to their latest album, St. Anger. I give you:

Lyrics from Damage, Inc., off the album Master of Puppets (1986)

Fuck it all and fucking no regrets
Never happy ending on these dark sets

Lyrics from St. Anger, off the album St. Anger (2003)

Fuck it all and fuckin’ no regrets
I hit the lights on these dark sets

Have no idea why I only just noticed that. Or even why it is particularly interesting. :-)