@sr1200: You should also post in the microphone section thread. Are the PSUs the same (same transformer, etc)
Also, it is possible that the diaphragms are difference thickness as well. (6 micron vs 3, I don't have any way to measure these, but I've swapped several 32mm capsules and by appearance, the skin looks thicker on the some) I'm not sure if that would make a difference, but intuitively I'd think the thinner diaphragm more sensitive at the same voltage. You are likely to get a lot more knowledgeable replies than mine if you post in the mod thread.
@scott, +1 to the above. You should also go through and renumber the parts on the Royer schematic so they match the PCB. That makes it a lot easier to visualize.