I wouldn't get stressed about it. While not QV, I've had Norma Decas that varied in color and they were all real.
The big thing to watch out for with QV is to make sure the hologram is there, a real hologram. The fakes are obvious.
Myself and a friend both were running deca at the same time. We both got our deca from the same source, and his was like 3x darker than mine. Both were real. I would not worry about it.