What is the difference between the internal structure of Uranus and Neptune from the internal structure of Jupiter?

Jupiter’s atmosphere, gradually thickening, turns into a liquid state. Then the pressure becomes so great that the hydrogen acquires the properties of a metal, and a layer of metallic hydrogen is located here. In the center there is a core consisting of oxides of silicon, magnesium, iron with impurities. Neptune and Uranus have a slightly different structure. The atmosphere is composed of hydrogen, helium, methane, ammonia. Then a mantle, consisting of a mixture of frozen water, methane, ammonia. In the center is a stone core.