Storm rips off Columbia, Track rips off AMF, Roto Grip rips off 900 G, Dynothane Japan rips off Track, etc. It happens. There are only so many colors that can be used and there will inevitably be duplicates.

+1.  Hammer rips off Storm (First Blood and the VG, Wrench and the Fire Road), Columbia rips off Storm (World Beater and the VG), Ebonite rips off Hammer, and the list goes on with all of the manufacturers.