This can already be achieved using existing features. In the Options window, go to Compare → Folder, set Compare method to Existence, and set Additional comparison condition to: abs(LeftSize - RightSize) < 1KB With this setting, files whose size difference is below the threshold will be treated as identical (see attached screenshots). As an alternative workaround, although it may be slower, you can use Tools → Customize Columns…, add Size via Additional Properties, and then enable Size (Diff) as...
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