Superpack: Rogues and Vigilantes / Offense Amplifier

[r0y]

I bought seven Rogues & Vigilante packs from the AH, opened them all up (got 5 ATO's total) but the last pack I noticed that Offense Amplifier was given twice:  one was orange, the other purple (rarity color of the "card").

 

                                         ^{(check out this awesome draw!  Makes you want to spend more money, donit?)}

 

At first, I thought maybe there's a "stronger" version, or one that lasts longer.  Nope, they are the same (system mail shows "Available: 2").

 

So my question is:  Does the card color not matter?  I thought all of the above stuff would be gray or yellow; I certainly would not consider a temp buff worth more than that... even still, why would the same lousy buff be in both the orange and purple categories?  Could there be an issue with the loot table?