VGFacts

It's obvious that Bianco Hills from Super Mario Sunshine is based on Bo-bomb Battlefield from Super Mario 64.

-Both are the first levels in their respective games
-Both have a mountain/structure that must be climbed clockwise while dodging giant, spheres.
-Both level's boss is confronted at the top of said mountain/structure

I don't know about that one man.

Never noticed that until you said it. Just like Psycho said, Not sure about that. The level could've just gotten a little inspiration from Bob-Omb Battlefield.

Maybe inspired, but if you could find something that says they are definitely connected and add the link here, then it should be reviewable. At this point, it's probably not going to stand. Never hurts to try, though.

I do see a few things similar with Bianco hills with Bob-omb battlefield. But keep in mind that Sunshine was one of the 'planned ideas' for a Super Mario 64 sequel.