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#10
Of course the install.esd file in ESD upgrade method is about the same size than SoftwareDistribution folder content in UUP upgraded Windows 10. That's the idea, install.wim is essentially the same than UUP upgrade files.
The size difference can be seen if you compare the combined size of downloaded UUP files with size of $WINDOWS.~BT folder in an ESD upgraded machine: that folder can be up to 5.5 GB against round 3 GB SoftwareDistribution folder in UUP upgraded machine.