Well, I just did a side-by-side comparison with my Davidsen 6152, my Davidsen MM20 and a "normal" 44mm PAM rep, and the dial face is definitely smaller on the 44mm. I know Davidsen uses larger dials in his 44mm cases than the "normal" reps, but I would bet dollars to donuts that you'll need to grind away some of the dial edge to get it small enough to fit.
Now, the $64K question is if the dial openning from the front of the case of your 201A big enough so as not to cover any of the markings of a 47mm dial. I'd bet the 2533 dial would work, the markers seem to be set in a good amount from the visible limits on that case. I'd be a little nervous that some of the red border printing on his Cali dial would get covered, especially the "Swiss Made" at the bottom of the dial...