Can confirm that's not an 83 injector, they are noticeably larger and are not interchangeable with the later model injectors. I don't know about the nozzle sizes between 83 and later, but I believe the injectors out of a Ford 4D55 are interchangeable with those out of other applications. The external differences may just be due to different model years
The 4D55 was available in the Dodge/Mitsubishi trucks from 83-85, but Ford didn't get the 4D55 until 86. Have not compared the Ford injectors to the ones in my 4D56, so I don't know if there is any difference there.