A ROM (Read-Only Memory) is a copy of a game's data, often extracted from a cartridge or disc. WBFS ( Wii Backup File System) is a file format used to store Wii and Wii U game backups.
A "WBFS exclusive" for the Switch doesn't exist. Downloading files from sites using these mismatched keywords often leads to malware, surveys, or broken files. Super Mario 3D World: Wii U vs. Switch A ROM (Read-Only Memory) is a copy of