The trick here too, is know who is making the gear.
Gene's colors are slightly more unique than other makers. Heck I even had a OSOE 3 day pack in tan that I swear was freakin Yellow.
Not that any one is bad, just all a little different. ATS, BFG, DBT, Endom, Eagle, TT, HSGI, TAG, BHI, the list could go on and each will all have differnt shades of the same color, depending when it was sewn, per spec, what was on sale or the fabric lot.
It all varies.