Do I update my SAT Subject Test scores?

I already submitted my UC apps and said that I would be retaking my Math 2 subject tests and taking the Lit test. I just got my scores back and my Math 2 score was exactly the same as the first time, and the Lit is my lowest score, that I don’t really want to submit. Because I told them I was taking those tests, do I have to send those scores and update my app? If not will they wonder why I didn’t send the new scores and will it hurt my chances?