Can't give a scientific response, only what I have observed. The makers of coated strings, like Elixir, also coat the plain strings against corrosion, so that's an obvious difference. Martin SP strings have a brass plating, Martin FX strings do not, and although the gauge is the same as the SP's, the FX plain strings sound especially tinny, by comparison. I'm sure, as you say, there are audible differences with other brands, as well.
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