That’s the most I’ve ever needed to do when I’ve swapped a neck with a Fender-spec’d heel into a Fender body. P and J necks have the same sized heel.You will probably need to do a set up each time you switch necks. No two are alike.
This is one of the simplest mods, but small adjustments are usually needed in the end. If you don’t like the result you can always reinstall the fretless neck.

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