The intent of your question is unclear. We not only cannot measure the parameters of elementary particles absolutely, but in quantum theory the idea of exact measurement is not well defined and probably meaningless.

Conversely, there is no simple distinction between any two particles with the same quantum numbers. If you give me two electrons of teh same charge and different coordinates, and then you swapped them somehow in some sense, the quantum mechanical view of the situation would be unchanged. If there were such a thing as a material difference between two elementary particles of the same kind, that could not be the case, so for all practical purposes they would be as similar as any conceivable technology or logic could tell.