Baldur's Gate 3 is one of the closest representations of put to video games. It accurately recreates most of the D&D 5e ruleset, from turn-based combat to the ability checks characters have to make. However, Baldur's Gate 3 is not a one-to-one replication of the game.
Baldur's Gate 3 is riddled with changes to the D&D 5e ruleset from top to bottom. Many of these are minor, such as tweaks to specific abilities and their functionality. Some changes are much more substantial, with sweeping changes to how the D&D 5e rules work as a result.