Drive shafts fit Darts AND Chargers???

We were pulling a dual exhaust off of our donar, 1973 4-door to put on my sons 74 Swinger when we noticed the following painted in paint pen on the drive shaft; "76 Charger 904" and "DAP". Did these two cars share this part or is it some weird mis-taken writing? Would any other parts interchange as well?

000_1340.jpg

000_1336.jpg

000_1339.jpg