I downloaded the setups from the links, and used the "Extract" option in the installers. It appears that only the license was changed: http://pastebin.com/G3H78tSt

Edit: However, the installer binaries' sizes differ by 113280 bytes, while the extracted files' size totals differ only by 925 bytes.

Edit 2: the majority of the size difference is in the .rsrc section, the newer version contains several additional binary resources, some of which appear to be boot loaders. And the text resources are different... is it possible the installed versions are different and the extracted ones are not?