Yeah, definitely a different mix. The whole song has a weird "underwater" kind of tone to it that may not be intentional (the audio on the WID music video on LP's Youtube channel is all fucked up too and has been since the day it was uploaded - Youtube does weird shit to the audio depending on the encoding of the original file), but the levels are also a lot different, there's an additional vocal part an octave below the melody during the second verse, and Rakim's last "you're guilty" line echoes a lot longer on this version.
*Edit* And yep, stems for the song should definitely be available on Project Spark. Unfortunately I don't have an Xbox One or a device that runs on Windows 8 (nor do I ever intend to own either one), so I won't be taking part in this. I guess it's up to other people to get the stems...hopefully this doesn't turn into another Guitar Hero/Rock Band stems type situation where it takes over a year for them to actually get "out there."