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The whole point of 15 and 20 amp circuits is to prevent fire. Circuit breakers, fuses, wire gauges, outlets and plugs that change with amperage, that's the whole entire reason for all this stuff. Its all intended to avoid a situation where the current draw is so high the wires get hot enough to become a fire risk. Period. End of story.
Understanding this then you need only ask if what you are plugging in is going to draw more current than the circuit can handle? If the answer is no then no harm no foul no worries.