I have two apps on playstore, and they have the same icon size displayed
but one of them has a considerable white frame around
I checked all the individual icons and size and compared them between the two apps. There is no difference.
Do you see that same as me at google play, if you click the links on the Android phone?
https://play.google.com/store/apps/details?id=de.mdliquid.refreshratetester
https://play.google.com/store/apps/details?id=de.mdliquid.streetpilot
Strange, if you click on PC there is not difference.
I don't like it, looks bad, but sofar no idea.
The Google Play store masks the icons of the apps that's why you are seeing those white frames around them. and i think that the site is not updated with this masking feature.
Original icon assets that have not been updated per the new specifications will eventually be migrated to legacy mode and scaled down 75% to the keyline grid size (512 * 0.75 = 384px). (From Documentation)
Have a look : Google Play icon design specification