Is the Wrx rear diff the same as SVX rear diff?

[LiquidForce]

The reason I ask is that I had my SVX rear diff converted to 411 so I could run it with a Forestor transmission. I have since picked up a 6 spd for my WRX so I put the WRX 5mt in the SVX. I also installed the rear diff but the pasenger side axel does not fit. On the SVX (now 411 diff) i can see clear through where the axels go. On the WRX diff there is something in the middle. Its 3 inches deep but the axle stub is closer to 3.5 inches.