What Two inner planets are most alike in size mass and density?

The two inner planets that are most alike in size, mass, and density are Venus and Earth. Both planets have similar diameters, with Venus being about 95% of Earth's size, and their masses are also comparable, with Venus having about 81.5% of Earth's mass. Additionally, their densities are quite similar, reflecting their rocky compositions. This makes them the closest in terms of physical characteristics among the inner planets of the solar system.