There is no difference in the content. You are supposed to be able to download the windows version using an exe installer and the unix version just as an archive, but currently they only make the windows installer available for both. You need to email firstname.lastname@example.org to obtain a unix download link.
ComponentSource has added a "Unix Edition" to all JBoss documentation in the JBoss store.
If you select the Unix Edition when purchasing JBoss documentation, you will not be required to download a Windows executable file as part of the download. You will be able to directly download the documentation .ZIP file.
Your ComponentSource Customer Service Team