I booked an Alaska roundtrip ticket - not with an Alaska card.
Today I got the ATMOS™ REWARDS SUMMIT VISA INFINITEŽ CARD. So if i change my current flight even slightly and pay the difference in fare with the new Summit Atmos card- would I get the free bags? Or would I have to cancel my current card and put that in travel bank and then have some that requires the Atmos card to pay? Or would neither of those work?

Thanks in advance for your help.