I haven't seen the UNIX version of the documentation but I think the difference between the two versions would lie in the delivery mechanism that Component Source uses to deliver the PDF documentation from their servers onto your desktop. In the Windows version anyway, you don't download the documentation directly but rather download a small application that downloads the files for you.
I bought and downloaded both, AFAIK i couldn't tell the difference between them, I still have to read through them, but initially I just skimmed through.
There's no difference between the two.
java is independent special platform,so I think there is no any difference