How different would the internal composition of a carbon planet be from that of Earth?

My idea is a carbon planet 50 % larger than Earth and with 5 times its mass (approximately), but I set these values "‹"‹after investigating those of several discovered exoplanets and none of them is considered a carbon planet, they are probably more similar to Earth in terms of their internal composition.

I understand that the planets of carbon could have a mantle of carbides instead of one of silicates as with Earth; and if they are massive enough, they could have a diamond layer near their core. Would there be any significant change with the mass of the planet considering an internal composition like this? I mean, I understand that the mass of exoplanets is estimated considering an internal composition like that of the Earth, but the fact that the planet has, for example, a mantle of carbides instead of one of silicates, would the mass be different?

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How different would the internal composition of a carbon planet be from that of Earth?

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