I am not replying to the i94 side of this, just the "talking to" side. There are massive data sharing agreements between US and Canada customs. US and Canadia

I am not replying to the i94 side of this, just the "talking to" side. There are massive data sharing agreements between US and Canada customs. US and Canadian sides can pull full criminal records, and a pardon means nothing. Exit data is shared in both directions as well.