ClieOS I have no idea. The retailer is the one authorized retailer Dunu specifically listed on their website as exclusively selling the DN-1000 (I know there are other sellers now). I mean, I really don't care because my DN-1K sounds excellent! It just came in this week and it's not overly bright. Yet, I ordered it almost three weeks prior. So I have no idea with version I have and I'm not worried about it, but I did ask the retailer about it and that was his reply. If people get different sound versions I hope they're happy with it. I just thought I would share the information given to me. It is interesting that Dunu isn't saying much about how they tweaked the sound though.
From the impression I got from the marketing's message, I don't think there is a major difference between the Chinese vs. International version anyway. The basic sound signature should be more or less the same, they probably just redo the filter / damper to smooth out a few more dB. I bet changing eartips could yield similar result so I won't be too worrying about it.