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The question is which piece would you rather replace? The plug or the pan? If you create corrosion the less noble metal is the pan so it would be first to corrode and lose material possibly the threads.
What I'd really be concerned with is if the plug is overtorqued you will be replacing the oil pan, rather than a cheap plug.
Galling generally occurs with 2 similar metals that are torqued without adequate lubrication. You can go buy 2 stainless pipe fittings, torque dry and they will most likely never come apart again.
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