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Protons and neutrons have approximately the same size and mass. A neutron is slightly heavy than a proton to be more accurate. In general we can say that they both have same mass which is 1 amu. The actual difference is 2.31 x 10-30kg), but are different charge (+1 and zero respectively).

Also, an electron and positron have the same mass and size and more generally, any particle will have the same mass as its antiparticle.

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