So i've noticed a difference in the same Excotic Armour gear. For instance, with Mask Of The Third Man. Mine has blue eyes while my brothers has green. At first I thought it was simply a rare drop. But then I noticed that my An Insurmountable Skullfort didn't change color with different Shaders while my brothers did. I thought it was pretty cool. But wasn't sure why. The only thing I can think of is that I play as a male and my brother as a female, so maybe different sexes get slightly different modifications. I'll try and check out the rest and see!