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Type will be somewhere between the two. Colour will depend on whether the white is dominant or recessive, what other colour and pattern genes the white is carrying and the base of both birds.
What I can say is that you are almost certain to NOT get black with white spots. That is mottling, and is a recessive gene. For it to show in adult plumage to any extent, both parents must provide a copy of mo to the offspring. You will sometimes get a very small amount of mottling in a bird with one copy of mo, especially in juvenile plumage.
Chances are pretty good that the offspring of a cross between a sultan & a cochin will have a small crest, foot feathering, 5 toes & a V-comb as those are dominant traits.
However, I am not sure what you mean by "sultan silkie."