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They are not the same thing. amazon identifiers are country specific. calibre itself uses amazon_COUNTRY_SUFFIX for amazon country specific identifiers with plaing amazon: meaning amazon.com (i.e. US amazon). mobi-asin is used for identifiers that come from MOBI files, where it is not possible to know what country the identifier belongs to. Plain asin i snot used by calibre itself.
In any case you can always sue the search and replace function in the bulk metadata editor to merge identifiers in bulk.
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