That's possible, but I don't think Daaaa Bearse would prepare for Orton much differently than they prepare for Palko. And they know Orton pretty well having had him on their team for several years.
Maybe Haley thinks Palko will have the advantage of being less familiar to the Bears defense than Orton would be and that would give Palko a slight edge.
If that is what he is thinking, then he is just grasping at straws, IMO.