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As per the title, you can download free to play with another player that owns the game NAMCO MUSEUM for the switch. It's a 765MB download.
"PAC-MAN™ VS. (Free Multiplayer-only Ver.) is a free download from Nintendo eShop which allows you to play PAC-MAN™ VS. with another player who owns NAMCO MUSEUM™ for the Nintendo Switch™ console.
Become Pac-Man or a ghost and challenge up to 3 other players* in classic gameplay with a multiplayer twist!"
I saw this, and downloaded it because I love a freebie, but don't know anyone with the full game :(