CANPASS is only for both American and Canadian citizens coming into Canada, whereas NEXUS is a pilot project with the U.S. Under it you would submit one application and receive one card allowing you to go both ways in a dedicated lane, only by identifying yourself with your card.
CANPASS s'adresse seulement aux citoyens américains et canadiens qui entrent au Canada, tandis que NEXUS est un projet pilote conjoint avec les États-Unis.