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Carriers are different, H165B uses that stupid collapsible spacer etc. but pinion & ring gear as well whole differential part is interchangeadable. Nismo sport option gears and LSD-parts are same for H165B-R160 and H190-R200. Differential side bearings are different, almost everything else is interchangeadable
The viscous R160 centre may be able to be adapted to an H165 with some work. This does not mean the ring and pinion can be interchanged between R160 and H165B or H190 and R200 differentials.
I just measured an R160 pinion gear and if it could be installed in an H165B carrier the pinion gear would be sticking 30 mm out the back of the housing of the diff. These are two completly different designs of diff, as are the H190 and R200.
Pinion gears and ring gears do not interchange inspite of what the site may say.
In my nismo catalogue the lsd centres are not interchangeable and have different dimensions. H165 ring gear 165mm OD and 102 ID; R160 ring gear 160mm OD and 102 Id.
I have posted a pic of the R200 crown and pinion next to an H190 diff.
Transfer
