You can sign back into your 2023 TurboTax return and select Add a State. You will be able to get a credit for the taxes paid to California on your Colorado return, so you should amend to get the additional refund and not pay taxes twice on that income.
Compete the California return first, the go back into Colorado and indicate that you need to amend. Look for the section with credit for taxes paid to another state and add the information (TurboTax should transfer the info from the CA return you just completed.)
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