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Unfortunately, the "damage" is already done. You could still apply for the Synchrony Amazon store card, though, although the promotional offers are coming to the Chase card: https://ficoforums.myfico.com/t5/Credit-Cards/Chase-Amazon-Visa-is-about-to-get-better/td-p/5197366
I think it automatically applies the APR when you make the qualifing purchases on Amazon.com. There is a post on the forum a few months ago when the mailers went out. I think I tossed mine. I think it was titled "Amazon prime card is about to get better" or something like that.
You got the better card in the long run.