Yes and no, the bar is the same dimensions. The holes for the R180 and R200 diff are spaced differently. It's best to acquire the proper bar for the diff you use as drilling this steel spring material is very difficult.

ezzzzzzz, I believe Marty is referring to the curved brace below the moustache bar (see the photo Z's linked and look at the bar at the bottom of the diffy). It connects to and braces two rear vertical transverse link plates. In the early 240zs, this bar was straight and as part of the R200 swap this bar had to be replaced with a later model brace.

I believe you are right, ktm. That's what happens when you're suppose to be working but skimming the Z forums instead. Thanks for correcting me.