I'd say..... partial rewrite.

The interesting thing is that quite a number of my older songs are done like that.... But not necessarily intentionally. I had written the song complete with a melody but then let it set. When I revisited it, I couldn't remember what the melody was so I just made up a new one.

BTW: that's Suno's MO. One lyric, two melodies.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.