Personally, I will always believe that the original Miles Warren died in Shea Stadium and every Miles/Jackal that appeared after has been a clone. Miles regaining his sanity and saving Ned proves it for me.
That and Clone Saga Jackal, who claims to be the original, constantly tells you everything out of his mouth is a lie. He's just an augmented clone. Plus, I find it a fun irony that there's a ton of Miles/Jackal clones out there all believing they're the original when that was exactly the fate he planned for Peter.