Well, ok, but so what? The difference is, as always, 1 AP. A ranged unit can KO at a distance of 2 tiles, and generally would be able to use the next AP to move over the downed unit and stomp. HOWEVER, this does not apply if the final square is a deploy tile! See this diagram for illustration (I know, these graphics are so 1980s, right?). The Ninja has 800HP and no resists. The Imp has 300 damage. In 5AP, if the Ninja wasn't on a deploy tile but anywhere else, the Imp would be able to do a 5AP killstomp. But not now!
So, just a tip - keeping your unit on the deploy tile basically gives +1AP protection against ranged units.