From what I've read the pans fit the same, the differences in pans are irrelevant to the sealing area. From looking at a z31 gasket, it looks identical to the surface of a z32 pan as well. I'm in the middle of replacing a pan in car and would love to throw a complete rubber gasket in there instead of the RTV.
Follow Ups
Anyone used a z31 rubber oil pan gasket? - 91Z32TT18:28:06 01/10/11