iCloud restore of New iPad - missing data?

have restored new ipad icloud. according 'manage storage' tab in new ipad settings, backup of previous ipad 640 mb (done before restoring new one), , new 1 showing 595 mb.

have idea of 45 mb has gone?? or asking dub question?!

 

same thing happened me. device worked afterwards. i'm sure apple knows it's doing. don't worry it.

 

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