Deductions & credits

I am not in the ERS department as far as I know. Just trying to get clarification of how the credit is calculated for the LookBack EIC and ACTC using 2019 income or earned wages. Does it use the 2019 or higher earned income and calculate the EIC credit according to the new 2020 table. Or does it take the 2019 value of the EIC given that year and just populate that into the EIC for my 2020 return. People are getting the impression that the value needs to be exactly the same and mine is $58 higher of a credit than 2019.