1970 duster steering column.

As a whole column, '70-73 should interchange. Yes, the '70 had the ignition lock linkage on the floor shift models. The '70 and '71 used a different lock cylinder and upper housing than the '72-3 also. Other than that, it's most an appearance difference. You may also want to take a look at the ignition switch and turn signal harness plug to make sure it has the options you need, or, you will need to swap those out to match the needs of the car.