There are several fabrics used in leotards. If you have a nylon leotard, than the fabric is the same as in a swimsuit. As long as the leotard style is a tank (sleeveless), than it is basically the same. The only difference would be that the leotards tend to have more coverage on the back, as swimsuits are usually more open.
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I'm not aware that they change leotards if ur talking about changing between apparatus,
but for some of the men's gymnastics apparatus like Pommel they put leggings on.