Difference is that the short one is the one for use with the E.III. Look at the instructions, it's got a shorter back end so it doesn't protrude into the model (requiring a cut) or stick out too far. The long version would be more accurate if leaving out on display visible from behind. You can't see the backside very well when mounted in the model, and when you do, it should look "cut off" because the rest would be inside the fuselage.
I'll have to remember this is there for when I build one. :p
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