Banjo-Kazooie Nuts and Bolts music help

So i’m pretty confused with something. I was looking through the soundtrack for nuts and bolts and i noticed that the nighttime versions of the worlds themes are included and i want to know where they are actually played in the game because when you go to the worlds at night, only one theme plays and they dont have those separate themes.

if you dont know what themes im talking about, here is a link to listen to the nutty acres one: https://www.youtube.com/watch?v=gUBKaaAHCqU

Help!