from how i understand it, the various neck widths (1 11/16", 1 3/4" & 1 7/8" at the nut)
require different dimensions to be routed for the neck/fretboard extension pocket at
the heel block, so it may not be as simple as purchasing another neck & swapping it out -
the cost to have another neck built, to rerout the neck pocket & setting up the guitar would
likely be more $ than what was originally invested in the guitar, if it was purchased new
it is possible to replace the nut with one that has 1 3/4" spaced slots & sanding the edges slightly -
this will not change the neck profile, but it will give a scoche more room between strings,
albeit at the expense of having the E & e a bit closer to the edge of the fretboard