IS Dart Sport fender same as duster?

You need the entire front clip for that swap. I cant believe no one stated the most obvious diff, which is front to rear length due to the darts "beak" in that year. You will need the darts fenders, and hood, grille, and bumper. It is NOT as simple as the wheel arch. I had to resell some duster fenders i made the same mistake with.

This is correct. The Dart fenders will not fit with the rest of the Duster front clip. The only way to do the swap is to change out all of the body parts from the doors forward. In addition to the fenders, hood, grille and bumper, you'll also need the hood latch support and the header panel (the "beak" in this case).