Would the colors on the package of her toy be correct?
Or, would it be possible to find the difference by comparing it to another pony?
For example, what's the difference between day Twilight and night Twilight?
Could the difference of night and day be taken into consideration for Sunset Shimmer's night colors to turn them into day?
Is that what the Vector Club is doing to find the colors?
(Sorry if my explanation isn't making sense, I'm thinking of it like an algebra problem.)