For you REALLY anal guy's (or trivia buffs) here is some further info:
The silver on the copper 99's is different than the silver that is on the 2000 + 2001 Blue/silver
The gray on the black/gray 99's is different than the gray on the 2000 red/gray
The black on the 99 is different than the black on the 2001
The blue on the 2000 and 2001 are the same, but different than the blue on the 2002 blue/black
The black on the 2001 black/gray is the same black on the 2002 black/blue.