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Depends on the appliance? What are you concerned about?
Does it have a slide switch to change it from one voltage to another? How about multiple line cords with more than two pins on the AC connector?
The reason I ask is because a lot of modern AC powered appliances use an off-line switching power supply which usually is designed to operate on any voltage from 100V to 250V without changing anything. If it is one of these, then it will not care.