It's just assumed that you use the same hand-crossbow for both the attack using your action and the attack using your bonus action. The bonus action attack granted by Crossbow Expert is not an off-hand attack, all your normal ranged damage bonuses would be added too the attack.
Cheers! So given that,
functionally the Larian implementation of being able to equip two hand crossbows and use one for an action and one for a bonus action (with normal damage bonuses) doesn’t seem any different from a 5e character with the Crossbow Expert feat, at least if the weapons held in each hand in BG3 are identical.
I might in that case be okay with it if we weren’t actually able to equip a hand crossbow in our off hand unless we had the feat (which I know isn’t implemented yet).
