Yeah, as far as I knew all Z31 Turbo's had a form of LSD. The late Turbos, MKII, had a clutch-type differential while the MKI I think had a viscous type.
In addition, my understanding, the turbo diff also has different splines in the axle. So if you go that route, the turbo Z31 axles are required.
I currently have my stock open differential with the NA MKII rear end. Because the NA MKII rear end is basically the same as the S12, the only difference is that the hub allows for a vented rear disc. It was literally plug and play. I dropped down my stock S12 rear and bolted up the Z31 NA MKII rear end. The bolts all matched up, the brake lines had to be slightly massaged for clearance spacing on the hub (not much at all) and the Z31 axles bolted right in. For this reason and simplicity, I suggest this route.
Turbo is ideal but has the possibility of containing more issues.
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