Is there anything special about an SVX rear diff?

I have a rare chance to get one cheap, and just wondered if it was an LSD or anything?

I think most (if not all) had LSD's.

Not sure of the other differences but here is a link to a post on the SVX board where they talk alot about the rear diff, and using other Soob diff's in place of the SVX one.

http://www.subaru-svx.net/forum/showthread.php?s=&threadid=20171

I believe they are the same thing as found in the WRX????