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Well, the mobi-asin wil never be overwritten, since calibre uses this specifically for the asin that comes from the book import. This is because Kovid doesn't want the asin link to Amazon.com to appear for people who buy on a non-US domain, like amazon.de, amazon.co.uk, etc.
when downloading metadata from amazon it pulls in the amazon: identifier, which is why I suggested the mobi-asin usage.
You can check to see what kind of stuff gets updated, and if those ids will clash.
For instance, if you only get metadata from Amazon and Google, which is the default setting, then assuming you don't have any Google Play books, none of your identifiers will be added to books. It will only add the google: and amazon: identifiers, and amazon: isn't used, google: is only used if you have Google Play books, which for example's sake, you don't have.
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