Yes, as long as your Lineage II account, Blade & Soul account, and your Aion* game account are associated with the same NC Account. You can use NCoin freely across Blade & Soul, Aion* and Lineage II from the same wallet.
*Aion uses Black Cloud but still allows in-game conversion of NCoin to Black Cloud Coin. This exchange is a one-way conversion, meaning you cannot convert Black Cloud Coin to NCoin.