I would not think that the chemical properties (reaction rates, energies involved in chemical reactions, etc.) would be different to a degree which is measurable. The electronic properties (energies of ground and excited states) are different enough to be measured, but this is because these energies, or more exactly, the difference in energies between different levels, can be measured with such extreme accuracy using spectroscopy. Also, different isotopes of the same element can have different nuclear spins, which can also affect the electronic energy levels, with non-zero nuclear spin isotopes having splitting of the electronic levels via the hyperfine interaction. Still, while these effects are visible using high resolution spectroscopy, I would not expect them to change the chemical behavior in measurable ways.
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