4 kilograms represents the MASS of the entity that it refers to.
4 kilograms is equal to 8 pounds 13 ounces.
4 pounds 5 ounces is equal to 1.96 kilograms.
Four quarts equal a gallon.
Four tons and 4000 kilograms are equivalent in weight, as 1 ton is equal to 1000 kilograms. Therefore, 4 tons is equal to 4000 kilograms. Thus, neither weighs more; they are the same.
There are 1000 grams in one kilogram, therefore 4000 grams is equal to 4 kilograms.