Fortnite creative was an additional gamemode that was released on December 6, 2018.
It allowed to play various different gamemodes that have been created by either Epic Games or various third party creators.
Creative 2.0 is a recent upgrade to Fortnite's creative gamemode that was released on March 22, 2023. It is powered by the new Unreal Engine 5.
It allows similar creations to the first Creative gamemode but with far more creative freedom due to a superior engine.