drop in disk color different from real leopard install disc?

i made an interesting discovery today, i found out that my leopard drop in disc that came with my imac, has a purple-ish twirl on it, normal, on the normal leopard install disc that you buy for $129, has a reddish twirl on it instead, in both, the install icon when its in the drive, is purple, do you think apple had a problem with the printers that caused this reddish color instead of purple? here is a picture, the one on the left is the drop in disc:



taken with my se w580i, 2 meg camera