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Tomato Ketchup has more of tomato paste and contains some spices also. Whereas, tomato sauce has tomato paste with some salt & sugar.
In the US, ketchup is prepared with tomatoes, sugar, vinegar/acetic acid and spices. It is used as a dressing or table condiment. Ketchup is cold and is never heated as a rule. Tomato sauce, on the other hand, is made from tomatoes, oil, meat or vegetable stock and spices
Tomato sauce is made from tomatoes,oil,vegetable stock and spices. It never uses vinegar. ketchup is made with tomatoes ,sugar,vinegar and spices.