Nintendo is not known for massive free DLC drops for 2D Marios. However, the (approx 450 MB) is critical. Here is what the "exclusive" update patch contains that the base cartridge lacks:
For the part of your keyword, most scene groups release the game as a Base NSP/XCI, followed by a separate UPD (Update) file. To get the complete "exclusive" experience, you need the base game plus the latest patch. super mario bros wonder switch nsp xci update exclusive
Can be installed or "mounted" to mimic inserting a physical game. Nintendo is not known for massive free DLC