The Google Page Experience Scores Will Use AMP Version When Available
https://www.seroundtable.comIf you have an AMP version and your site is on mobile-first indexing, which all sites should be by the end of this year, then Google’s Page Experience update will measure your AMP page, not your mobile or desktop page.
John Mueller of Google explained this clearly in a Google webmaster video from last week at theΒ 43:50 mark. Google will use the page experience scores based on what the searcher will see after they click over from Google to the web page. And if you have AMP, Google serves the AMP version to users on mobile. Thus the AMP page is what Google will use for measuring with core web vitals and such.