Are the non-Vspec R32 and R33 diffs interchangerable?
Yes, technical internal are different 31mm vs 32mm or something, but in terms of fitting between cars they are the same.This is definite - I bought a used non V-spec R33 diff just for the stub shafts in order to fit an ATS LSD in my 1990 R32. Something like 31 vs. 29 splines.
yes, but the question was, are they interchangeableI will re-iterate as people aren't reading......
"Also the R33 diffs do not have the mounting lugs for the ATTESSA pumps that bolt to the top of the R32 rear diff."
So a 33 diff doesn't fit the 32 unless you bodge it.