There is really not much different other than the finishing touches. Would come down to which color your looking for primarily. Main differences below.
Classic Series '65 Mustang
Body Finish: Urethane
Neck Finish: Gloss Urethane
Neck Plat: 4-bolt vintage
Inlays: pearloid dot
'65 Mustang
Body Finish: Gloss Poly
Neck Finish: Gloss Poly
Neck Plat: 4-bolt
Inlays: white pearloid dot