It works, thank you very very much!
Isn't it strange that Calibre doesn't show the usual pop-up window to ask me what should I do with these specific duplicates?
I have sent dozens of similar 'duplicates' to my Kobo, but these ones must be special for some reason. If I compare their info all the basic stuff is identical, except for the 'Publisher', 'Year and 'uuid' fields, which contain clearly different values...
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