I think you do not need to start over.
Just go to the wrong W-2 that you entered and either change it to the correct W-2 info, or delete the incorrect W-2 and add the correct one. You can do this by
Federal Return > Wages and income > "I'll choose what I want to work on" (button) > Scroll down to "Wages and Salaries" > Find the line for W-2 > Click the "Update" or "Start" button on the right side of that line > Follow the conversation and enter the required data.
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