The Earned Income Tables are updated every year, so it would be unlikely to have the same EIC amount.
This would be so, even if you used your 2019 earned income to compute your 2021 EIC. You may elect to use your 2019 earned income to figure your EIC if your 2019 earned income is more than your 2021 earned income. However, you can't use your 2020 earned income instead of your 2021 earned income.
Since the EIC amount varies quite a bit from what you had last year, the table is probably using your 2021 Adjusted Gross Income.
You can see the tables and compare them to your Earned Income and AGI at 2021 Instruction 1040.
