Can HREFlang be used cross domain?
March 12, 2018
Using x-default in hreflang XML
April 17, 2018

Does HREFLang URL Order Matter?

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The order of the URL’s by country or language entries does not matter in the HREFLang Element meta tag nor the XML sitemap.  They are all treated equally .  I would suggest sorting them by the hreflang= so that it is easy to troubleshoot missing URL’s.