Hey mate,
basically, they are the same car with many interchangeable items.
The biggest difference lies in the false vents on the quarter panels.
Other than that, the 68 has reflectors on the 1/4 panels, and indicator repeaters on the guards.
As for what it should have and shouldn't, that comes from decoding the door tag, or getting a marti report (
www.martiautoworks.com).
Cheers
Jas