I did a quick check for you at realoem.com . You can enter your model and month, and get the official BMW part numbers for anything you need. I checked the basic info and all those months use the same manufacturing code/batch, so I think they are all the same:
04/92 - You Have Selected: P E36 Lim 325i M50 USA 19920400 L M
Production Code: CB33, batch ID: 47498
05/92 - You Have Selected: P E36 Lim 325i M50 USA 19920500 L M
Production Code: CB33, batch ID: 47498
06/92 - You Have Selected: P E36 Lim 325i M50 USA 19920600 L M
Production Code: CB33, batch ID: 47498
If I were you, I would go to realoem.com and drill down into the parts you want, and compare the part numbers for 04/92 and 06/92. If they are the same, I can't see why there would be any problems.