If you download a raw, unpatched Zombie Army 4 base NSP from 2021, you will run into issues:

Whether you're a seasoned gamer or new to the series, Zombie Army 4: Dead War on Nintendo Switch is a must-play experience. So grab your shotgun, gather your friends, and get ready to take on the zombie apocalypse!

Both versions typically include English, but the JPN version is tailored for the Japanese domestic market with specific localized text.