If you want to read more, look up Bell’s inequality and the related experiments. The result (briefly summarized) is that looking at one set of particles reveals

If you want to read more, look up Bell’s inequality and the related experiments. The result (briefly summarized) is that looking at one set of particles reveals no difference, but repeated experiments yield different probability distributions if entanglement is present. Also, entanglement is «faster than light», which does indeed have physical implications. Quite mind-bending ones, at that.