I find that i actually prefer different shades of HA on my surefires. my recent L1 came the same way and as long as i get 2 complimentary shades of HA (like 2 almost green instead of 1 green one tan) im quite a happy camper.
I think it just adds a bit of distinction to a mass produced light... and kind of reminds you that they are built for military purposes where slight colour variations are not extremely important (like new doors with a slight different tint put on a humvee).
Just my $.002
Dano