This hack is a different take on the previous The Lost Levels graphics hack.
In The Lost Levels, Nintendo replaced walkable mushrooms with clouds. In the other version of this hack, the mushrooms from the original game were retained, but they were replaced with clouds like in The Lost Levels here.
Database match: Super Mario Bros. (World)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
File CRC32: 3337EC46
ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7
ROM CRC32: D445F698