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It could go either way. Or more, honestly.
The Necrons are very feudal, so you can take some cues from the way real world armies work.
Vassal armies may choose to either don their liege's colors, or their own. Either is valid.
What's more, individual units may do the same. A unit that has distinguished themselves in battle may be awarded their own iconography and colors.
Finally, judging by their white dwarf articles, it could also be that Necron commanders will at times take the colors of their allies when commanding their troops.
In the real world, before the advent of radio, color and uniform acted as a kind of real world mini-map. That is why bright colors and flamboyant hats were so common. A commander could look at the battlefield and know who was where by hat shape and uniform color.
The Necrons honor these ancient methods of warfare. Playing a vassal army you should feel justified in using either your leiges colors, the vassals, or a unique color scheme.
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