I just got an AMR, Guide Lid, Grab-It, Bottle Pocket, Mini Belt Pouch, and Medium Pocket all in Wolf Gray yesterday. I only noticed the darker gray on the Guide Lid as others have previously mentioned. Doesn't bother me though.
Wolf isn't as greenish as the foliage/acu stuff, but it is still a cool grey. If you're worried about color consistency get multicam. Better yet, stop worrying about silly shit altogether. I don't say that disrespectfully. There are some things that really just don't matter, though. Matching nylon is one of those.