From the earlier info you have, we knew DP was 20. Based on you picture, my gut feeling was these were 14.5 PA. This was because of the rounded nature above the visible center-pitch line. 14.5's always look more rounded and 20's are flatter looking. Again, this was just a visual guess. My plan was to overlay 2 circles on the the photo, one pitch circle for a 20PA and another for 14.5PA. From there, two things can be viewed to make the determination. One is the amount of clearance in the root. Sometimes it's obvious just based on root clearance. The other is to draw tangent lines from the pitch circles then, overlay PA circles to see which circle best fits the upper curve of the tooth.
Water under the bridge since you found MrPete's information...
Let me know if you want to try to obtain 3 cutters of DP20, PA14.5 in size #3 (40 tooth), #4 (32 tooth) and #7 (16 tooth).
Send PM to discuss details.
Ray