Please wait before you do anything else. You have until 04/15/2022 to file your 2018 amended return. So you still have time.
Yes you can use the base information in TurboTax to amend all of the returns. Again, wait for the IRS to process the ones you've sent in.
You are correct in saying that things will get very messed up if you try to submit an amended return before the current ones have been processed.
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