This answer contains spoilers… (view spoiler)[While Neville and Harry were both born at the end of July and their parents had gone against Voldemort thice, Proffessor Dumbledore tells Harry (Chapter 37 of Order of the Phoenix) that only he can have the power to kill Voldemort because Voldemort picked him as a child. If you're asking whether Neville would have been the chosen one if Voldemort had picked him as a child, then yes, I'm pretty sure he would have been. But since Voldemort chose Harry to target then Harry is the only chosen one. The line from the prophecy "and the Dark Lord will mark him as his equal" explains this; Voldemort viewed Harry as having the power to destroy him from the start, whereas he didn't see Neville as a threat. (hide spoiler)]
Vy YES- that's what Dumbledore was trying to tell Harry, that the prophecy wasn't set in stone what gave the prophecy power was how much Voldemort put into the vision. It could have been Harry or it could have Neville, but he wasn't sure so he chose Harry because like him, Harry is a half-blood. Harry mentions this a few times, stating how different his life would have been if Voldemort had chose Neville instead. BUT Neville is really brave, and I'm sure if he was the chose one, he would have been just as much of a challenger as Harry was.