Steering Column Swap Question?

I have a 76 Duster that has a Floor-shift Steering Column that I would like to Swap into my 73 Duster that currently has a Column Shift Column. Both columns are for power steering cars.

I noticed several sites online that sold rebuilt steering columns listed the columns as 71-73 and then 74-76. Can anyone tell me what the difference is between a 71-73 vs a 74-76 and are they interchangeable?

Thanks.