I am not sure if this exactly matches your issue, but in the packages QA sent me, I see the difference is in the map:
4.6:
LogPakFile:Display: “AHub_WindowShipSize/Content/Maps/Example_Map.umap” 14,075,520 bytes.
4.7:
LogPakFile:Display: “WindowsShippingSize/Content/FirstPersonBP/Maps/FirstPersonExampleMap.umap” 204,870,115 bytes.
Those are two different map names, so I am not sure if they are supposed to be the same map, but it’s 200MB bigger in 4.7 - I’m not sure why, maybe our example FPS map just got a lot more complex? Possibly it more static lighting baked in. I can dig more into it if you expect the 2 maps to be the same size roughly.
BTW, I used the UnrealPak tool to check out the packaged files:
Engine/Binaries/Win64/UnrealPak /Content/Paks/ -List > PakList1.txt
Josh