NDF refers to non-delivery forward foreign exchange. It is a forward foreign exchange trading model and a derivative financial instrument, which is used for offshore currency trading in countries and regions where foreign exchange control is implemented.

Foreign exchange swap means that both parties agree to exchange currency A for a certain amount of currency B, and exchange currency A for the same amount of currency B at the agreed price in the future.

Swap is a spot transaction.

So it is a completely different concept.