No, you cannot file your second 2021 W-2 next year. It is likely that the IRS will reject your return since the W-2 is not on the return. In this case, you will have to add your second W-2 to your return and refile. If the IRS accepts your return, you will have to amend it to include the second W-2.
How to amend (change or correct) a return you've already filed
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