Heh...I have two LCD-2s...one first run production and a rev 2. I find they sound different.
Actually, kinda reminds me of back when I bought a Buffet R13 clarinet while I was still playing. Our private instructor got three of us together who were all looking at buying a new clarinet, and found a vendor that would send 4 units to us so we could try different ones and send one back. We each settled on one that suited our tastes and where we liked the sound. Now the tolerances on the LCD-2 are probably way different than the individual tonal differences in wooden clarinets, but who knows? I might not be able to hear the difference in two headphones of the same make, but then some people couldn't hear the difference between our different clarinets either.