The only way to test how much difference the fretboard on a guitar neck makes is to use different necks on the same body. This is only realistically possible with a bolt-on neck. Which is exactly what YouTuber Rhett Shull did.
Ok, there's a caveat here – it involves swapping out different necks, not just the fingerboard. And that means the individual neck's wood and radius itself has some impact on the sound. We all know two necks are rarely the same. Still, this is as close as we can realistically hear the impact and quite frankly, we're surprised.
