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They are very close but the neutron has slightly greater mass. The masses are as follows:

Proton: 1,6726 X 10-27 kg

Neutron: 1,6749 X 10-27 kg

The proton is about .13% smaller than the neutron Another good way to think about it is that the masses equate this way:

Mass of 1 Proton + Mass of 1 electron approximately = Mass of 1 neutron

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