Which drastically changes the playstyle of the deck. You can't use cards like cosmic cyclone to clean your backrow as well as increasing this card's attack, while air neos can. You also can't use last gamble to get the maximum attack.
And even then, they do have the same effect, and would have the same programming in DL.
In case of Air Neos and ASW, the programming for their effect would be exactly the same, only the "If" function for their effect's requirement is different.