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Repeated ISBN

I would ask something that concerns the award of a new ISBN number!

If I understand, if the rules for granting a new ISBN number, if the publication was reprinted in the new edition of another year, but without any amendments, remains the same ISBN number, ie. repeated an ISBN?
We know that the rules for bibliographic processing of books, this is not the same publication, because the issue are not identical. Is there a standard in the UNIMARC field or subfield in which it could be a steady formulation indicate that it is a release with repeated doštampanom ISBN?

Hello Sanja BGB!