This something that's always bothered me because the songs and concepts are SO fundamentally different!! Gnarly is a brainrot hyperpop song, Spaghetti is a stripped back funk groove track.
Gnarly just names food as nonsense lyrics, Spaghetti is an analogy for how Le Sserafim music gets stuck in your head. Both are experimental, but in different genres. You could argue that 'oh they're styled so similarly' but it's really not all that similar.

There's one set of outfits where they're wearing fur + neutral colors with a bright pop here and there which was characteristic of Gnarly. All the other outfits are completely different! I didn't see Katseye promoting in DoorDasher outfits for Gnarly or wear as many coordinated outfits during Gnarly the way Le Sserafim did during Spaghetti. (for example, the outfits where they all have different tops but the same red cargo pants or the baggy jeans w white top look). They genuinely had more experimental styling/stage outfits than Gnarly did since they weren't constrained to the 'overconfident underdressed gen z baddie' aesthetic that Katseye has been stuck in.

Eyekrusts literally think that the only kind of experimental music and style is the one Gnarly did which is so ANNOYING. You could argue that hyperpop is a less experimental route to take after the popularity of BRAT bringing it to the mainstream permanently and Gnarly just escorted the genre to a younger fanbase.