I think it's more commonly used for a small room near or attached to the kitchen where food may be stored and/or prepared (cold food).As far as I can tell, there's no difference. "Pantry" means "a large cabinet or small closet in or near a kitchen, used to store food," so to me "food pantry" and "kitchen pantry" are redundant.
I already gave a sentence, this one : The food is stocked in the pantry/food pantry/kitchen pantry.We need context, guilluame28.
Give us a sentence in which you would use these phrases, a sentence that makes it necessary for you to know the difference. What sort of thing are you describing?