I am thinking about replacing a 24 fret neck with a 22 fret neck since the one is wore out and my only current replacement is the 22 fret. The guitar is a jackson kelly and i'm just wandering how much the different neck would affect the tone for whatever reason. Any and all help is much appreciated.
You wont be able to just swap out the necks, you need to match up the scale lengths, which means you would have to either move the bridge or the nut to get the new neck to fit.

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so can you guys tell me how the scale length should measure, because I have no problem moving the bridge. I know for intonation i wan the nut to the 12th fret to be the same length as the 12th fret to the bridge, or is that something different?
If your scale length is right the 12th fret will be dead center of your nut and bridge. Your guitar should be a 25.5 scale. That means the 12th fret would be 12 3/4" from the nut.