The only way you are going to know if it changes your tax liability or the refund amount is to prepare the amendment. If there is a reportable change, file it. If not, cancel the amendment. The amendment software for Form 1040X is not ready yet. But when it is, use the instructions here to determine whether or not you will need to file Form 1040X. It is a pretty common occurrence, but at least starting in 2020, you can e-file the amendment if you have to file one!
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