First put it together and see what you have. It won't index perfectly, but you might be willing to live with it. If, as is likely you're not, replacing the RD isn't the solution. The answer is to match the cassette spacing, which can be done with any loose sprocket cassette that matches the wheel's splines.
The spacers can then be shimmed or sanded to the correct width to make the spacing match the campy system.
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