If you plan to reuse the same spokes the new rim needs to have the same (or close) ERD as the original. Before taking apart the old rim note how close to the top of the nipples the spokes reach. That will tell you if the new rim can be have a slightly larger or smaller ERD, and by how much, in case you can't find an exact match.
Otherwise, new rim, new spokes.
BTW- it's very easy to overtighten radial wheels. Resist that temptation lest you shatter the hub.
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