You would have to try to match the color by eyeing it, I don't think there's a specific formula to get it right! I would tint the fondant first. Wrap it very well and let it sit for a while, then do the others. You have to use candy colors for the candy melts, or Americolor makes a product called Flo Coat in which you can use regular Americolor for the candy melts/chocolate. I would be tempted to go that route, so you could use Americolor "ivory" for all three things- at least you know your starting with the same color.
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