I am not sure of the window cut outs you are describing. Where did you purchase them? Ask them for 6 identical injectors for the 94 NA. Nissan changed the injector design for the NA after 92 to the pintleless type which your car has. I recall when I replaced my injectors in the 92 to the new style there was a plastic cap at the tip with an opening at the tip to uncover the 4 small hole for the fuel to spray. The plastic cap retains the lower O ring.
Can you post pics of the 2 different types that you are describing in your post?