I agree with the last two posts; I should have recommended some way of listening to the results that would get around the lack of reliable auditory memory longer than a few seconds.
The experience is instructive; it's very good to realize how limited our perceptual abilities are in that respect. Plenty of self-styled "golden ears" render judgments as if they had that ability, when (being human) they don't. And for those of us who live at ordinary altitudes, it reminds us to make careful comparisons, not just "microphone X sounded better last Thursday than microphone Y sounded the week before in another location." I mean, that's a perfectly valid statement, but it says nothing one way or the other about the quality of either microphone.
--Back to the topic of microphone matching: I'd like to quote some bullshit that I just read on a manufacturer's Web site, but I don't want to give them any publicity by identifying them. This is, however, a manufacturer of equipment intended for use by professionals, who should instantly know better if they read any such claim:
Manufacturing tolerances have been minimized thanks to highly precise calibration of the capsule and the electronics – which means that any two microphones from this series, set identically, will always form a matched pair at +/- 0 dB!