I never did a comparison of the 1200 to the 200. My bet is that they will both be around 410-420 fps. They are essentially the same length barrel and Co2 is what it is. Now that you bring it up my curiosity is piqued. I'll put them both over a chrony and get back to you...........sometime.
I have the box and manual with mine. "420/450 fps Maintains velocity through 100 plus shots" according to the manual. HTH