> (If you would check the word SPECIAL in the title for both Cobra specials it is the same as the word SPECIAL in the Helix special, thus they are all part of the specials series not separate)
The fact that they use the same lettering does not indicate it's the same series. If you look inside the cover, they are titled as two separate series:
G.I. Joe: Special #1
G.I. Joe: Cobra: Special #1-2
Plus, the numbering clearly indicates them as two separate series. (That's how yojoe.com classifies them too).