No it won't be different. The torque split is defined by the epicyclic gears in the transfer case of the gearbox. But the 34/66% torque split is only applicable when there is no wheel spin. If you want a different torque split you need different size gears in the epicyclic unit.

The viscous coupling determines how much torque is transferred to the front/rear wheels in case of wheels spinning, so in that case it is no longer 34/66%. An uprated viscous coupling will allow less wheel spin. It's basically the same as what a rear LSD would do.