Rainbow Six Black Ops 2.0 is a total conversion for Rainbow Six Black Thorn, featuring a more complete and refined version of the fan-made compilation first released in 2011. It aims to offers the ultimate Rainbow Six experience from the Rogue Spear era.
The May 2022 release of Black Ops 2.0 adds the day version of Bunkers from Rogue Spear, complete with data to make it work in Custom Mission (Lone Wolf and Terrorist Hunt) as well as in Multiplayer. The night version of Bunkers was introduced with the Urban Ops expansion pack. Aside from the different lighting and weather, there aren't any layout differences between the two versions.