Same process really, it’s the fingerboard material that matters. Normally this will be some sort of plastic resin which may allow the frets to be removed without the splintering you get with wood. However often the neck and fretboard will be coated together as one piece so it might crack the varnish/finish but I guess you get wooden necks like that too.
Edit: may well be incorrect, stand to be corrected by our resident experts. I just recall talking to someone who had a carbon necked Vigier converted