Hell, for $75 you can get a pair of Beats Studio Hong Kong specials (Chinese knock-offs) shipped that sound the exact same...probably because they are built in the same factory using the same sub-par parts...
The new version looks silver when you look through the grills. The old version looks black through the grills.
I've only ever heard the newer silver version, though I have heard people here claim that they can hear the infamous "veil" on the black version, while it is not present in the silver version- fwiw.
LCD2 and LCD3. I've auditioned them both on several occasions on several different amps/sources and I just don't hear what it is that makes them all that special. It used to frustrate me, now I've just let it go.
For my ears I much prefer the HE-6 or HD 800.