The board game exposes the fact that the real-time engine of the video game is largely superfluous to the narrative-driven gameplay that is in essence event-driven and involves resource allocation and worker placement, things which do not require real-time and are better suited to discrete time.
It's been a while since i played either version, but as i vaguely recall, the survival mechanics of the board game are deeper than the video game. Most memorably, the scavenging is more 'roguelike' and less predictable due to the deck-driven exploration system, that is a side bonus is much simpler to implement digitally and easier to mod, compared to the digital version's handcrafted settings. And unlike in the video game, the items and characters drawn in a location in the board-game aren't frozen in time between the player leaving and his return. For example, you can't store an item at a location and be guaranteed it will still be there to safely retrieve on your return, or that you will meet the same people as the last time. Also, the combat system is more realistic less predictable and riskier. No more infallible stealth-killing by pacifistic housemates who suffer from anxiety disorders and have no previous combat experience.
The economic system of the board game is better balanced and less forgiving, and the player decisions in the board-game are more impactful and have greater strategic value, due to the fact the board-game involves tighter decision trade-offs. Overall the board-game is harder and less predictable than the video game. Overall, i remember the emergent stories of the board-game as being richer, more varied and more thematic, in part thanks to the accompanying large storybook of events and consequences that provides the narrative of situations via the card-event cross-referencing system.
The world of TWIM is static and largely empty, similar to how I imagine it must feel living as a student under an unscrupulous landlord during a covid lockdown, rather than how it must feel to live during a civil war. In all honesty, I think i lived under worse conditions as a PhD student living in the North of England, than the characters in the video game version.