As far I know the only diff between them is the sidemarker, so is posible to make it, just like 71 and 72 b bodies, 70/71 and 72/74 E Bodies, 70/71 and 72 Darts, and 67/69 with 73/76 Darts and 67, 68 and 69 Barracudas. Maybe it happens the same with some C bodies.
the 67-69 Dart fenders are not easily swapped, because the 69 headlight is in a higher, and more rearward position. The headlight mount panel is completely different between them. If you look at a 68 Dart from the front, the headlights look a bit bug eyed, where the 69 Dart has a more aggressive look, because for 69, they moved the headlights deeper in, and higher up to partially shroud the headlamp compared to the 68.
Also 67-69 Barracuda fenders have differences in the headlight mounts, and grille mounting provisions.
People also tend to think the 71-74 Charger fenders are the same except for the side marker. Not the case. The 71-72 side marker can be modified , but the 73-74 Charger fenders are a whole different deal. When Chrysler re-engineered the 73 B bodies for the rubber isolated K frame, this changed the entire inner structure of the front end. The fender wheel opening was raised up considerably. The fenders were also changed in the headlight mount area, and where the fenders mount to the rad support.
