IF you use the open containing folder ('O') method to change, the file name name must be EXACT what it was or sad things will happen.
BUT
Open the MDE and drop the 'update' version into the Formats. That takes care of any name differences (Any dropped format REPLACES the format of the same type)
Any conversion settings that were used for a conversion, are stored with the books data in Calibre (allow overriding Preferences: defaults)
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