I recently bought an M&P (yet to fire a round through it), and in my reading it seems widely accepted that the recoil springs are interchangeable. Not sure about the rods. Since there is stuff branded both ways I don't see any reason not to buy the stuff marked for the gun you plan to put it in.
If you don't have a specific performance based reason to change the Glock rod, I wouldn't... The more aftermarket parts you have, the less reliable the gun will be. I've seen that over and over. You won't break the Glock rod, not in 600, or 6000, or likely many more rounds than that.