[CRUZN69]

Differences are:
Taillights 68 small, 69 bigger
Doors, 68 has wing windows 69 do not (unless it's a 300 delux sedan)
Dash, instrument panel is different. Dash pad is the same.
Grill is different 68 metal, 69 plastic.
Fenders, doors, quarter panels and trunk deck interchange. Hood will interchange but hood hinges don't.
Front bumpers are different, parking lights are different.
Under the hood, the drive trains both are the same.
Just a few things.
Hope this helps.