As mentioned, there were some differences among the injectors I received:
If you look closely, you'll notice that the injectors on the outside are longer on top, but the injectors in the middle are longer at the bottom. So they are both about the same overall height, but the body of the injector sits lower in the former case. This makes no difference, if the injectors can be fully seated and the harness plugs reach.
Notice that the one on the left has three holes at the center whereas the one on the right has one. Both flow 42#/hour, but I have to believe that the spray patterns differ.