:lol:
Hell... playing right into Roo's hands (now where's that bottle of acetone?)
I get the impression from the TDPRI forums, if the dates are accurate, that this is quite common, and doesn't necessarily mean the neck and body were originally different guitars. Necks are quite often older than the finished guitar.
There seems to be some debate over how accurate these dating sites can be as well - due to the facts obtainable (ie serial number info) being somewhat variable. But this seems to particularly apply to Fender Japan - I had the impression that the Fender US stuff was reasonably accurate.
If you really want to know, I'd suggest asking around TDPRI - loads of people willing to "stick their or in" on subject like this. They're a little less relaxed and friendly than on here (especially to newbies who don't show the "proper" respect! :lol:) but they're still a very friendly site in the general scheme of things...
I suspect the sum of the answers will be - "it's probably YYYY, you'll never really know for certain but it looks/feels authentic, enjoy..."
EDIT: Sounds like Twinfan's been over there as well! :lol: