All FX CPU's are "Black Edition" CPU's. That term used to signify that that particular CPU had an unlocked multiplier, but since all
FX CPU's do, it's kind of redundant.
They are the exact same CPU's, though. http://www.cpu-world.com/CPUs/Bulldozer/AMD-FX-Series%20FX-8350.html
The odd thing is that the one that is more expensive in that link appears to be an OEM only model #. Strange.