I love the sound of my 4001C64S, and have a line on a 4001V63. Do these have the same tone or are they different?
Also, is there any difference in the neck shape/thickness between these two models?
The C64 has the cap (horseshoe pickup), the V63 doesn't, which gives it a deeper/more bass-like tone.
Necks on the C64 from seem to be consistent from year to year (on the thin side), whereas necks on the V63 vary considerably from early production (1984) to when they were phased out (2001). I have a 2001 (V63) and the neck is quite hefty. but nice. The tone is considerably different from C64 to V63, mainly due to the cap or lack thereof.
I prefer the C64, although, the bridge does lift more than the on on the V63. That's because the V63 has the additional two screws.