It would almost certainly be cheaper, easier, and better to scrap each carrier and design and build a new one from scratch; The Electro-magnetic vs Steam catapult decision affects almost every part of the ship.
It's like deciding to change your mind about whether to use a steel or a timber frame for your house, after construction has finished - replacing the frame, while keeping everything else, is not only gonna cost far more than demolishing the lot and starting again, but will also result in a house that shows the scars of the refit everywhere.
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