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I have no idea what you really did.
But the simple way is to copy the WHOLE Library FOLDER (contents),
replace the entire contents (delete it first) on the new PC
start Calibre. It should be the same as it was.
Note: if you did not ALSO replace the Configuration Folder CONTENTS, plugins and other USER visual customization will be missing
FWIW there is a FAQ on this task at the official HELP site
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