The Z32 300zx's used the R230 differential. Whereas the R32/R33/A31/C33/C34/S13/S14 etc use the R200.
There is a solid rear axle diff while was fitted to some navaras which was called the C200. I read somewhere that they used the same gizzards as the R200. I actually bought one of these diffs off trademe early last year. Side by side it looked VERY like an R200. I pulled the backing plate off it, and it was a CLSD too. The bloke I bought it off had bought it site unseen hoping it was an H190. But he than found it was too different to fit his housing. I would up on selling it to a mate of a mate for a CA18det powered KP60.
I would doubt that an R230 center (Assuming those 350Z'd still use that diff) could be used in a hitachi diff.