James is right and the 2 line HK COO with brown face paint is the one found bagged with the DT saber, which was the first saber. These sabers are also found carded on 12 backs with 3 line HK COO's. Not sure which one came first though and I'd say they where probibly released around the same time, maybe 2 different factories.
The reason China COO's go for more IMO is because there always a lot whiter than the HK versions as they where ROTJ released I think, also think the Scar COO and Raised bars and the rarest Luke variants.