Twice > Ive
This is purely based on the vibe and group's position in the industry, don't mix it with success and bring up stuff like "Nmixx is flopping unlike RV".
Nmixx is doing experimental music, which is exactly what RV was doing.
Twice was know for simply great pop songs and visuals, same as Ive now.
Aespa/Blackpink I think is self explanatory, like SM ain't even trying to hide what the blueprint was.
New Jeans are know for their specific sound and concept, same as Gfriend.
Mamamoo/Gidle is simply the closest I could think of. They aren't exactly the same but both groups rocked variety of concepts and have strong live performances.
Le Sserafim doesn't really remind me of any 3rd gen group tbh. If Itzy was a 3rd gen, I guess we could say LSFM is an improved and actual working version of Itzy's original rebelious concept.