Z33/34 diff is an R230, so yes, it should be physically stronger. Unfortunately it's up in the air whether or not the output shafts are stronger, as there's not a lot of people making enough power to actually break them.
Z33 axles are definitely stronger and Z34 even more so as they're 30 (IIRC) spline at the hub side.
Technically the strongest Nissan diff you can put in your car is a Z32 TT diff (R230) which has 32 spline outputs, and then DSS will modify them with 300M shafts. Not really sure how you'd break that this side of a Formula D car...
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