I've been told that the equivalent colors are very close. I don't have any crossover between my Citadel paints and my VGC, so I can't vouch for that, personally, but I can vouch for the quality. VGC tends to separate in the bottle rather quickly, so be prepared for a bit of shaking, but aside from that, I prefer it over GW in pretty much every respect. Only GW paints I use are a few metallics, washes, and a handful of foundation paints.
I also agree with Lego about matching colors. If you paint a large area with one gray and lay the other gray next to it, you'll probably notice a difference. If you move them a foot apart, you'll notice it less. If you add a bit of variation over and around it, you'll notice it even less. Even with my rather rudimentary shading and highlighting skills, I've used craft paints with only passing similarities of color to my GW/VGC and once the model is done, you really have to look closely to notice a difference. On the table or on the shelf, they look no more varied than any other models painted by human hands. The color variation due to lighting conditions is going to be more severe than that from the pigmentation, I'd wager.
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