P4 camera on the left, P4Pro on the right.
If there are any parts that are interchangeable, I’m not aware.
The most notable outside appearance is the size. P4 is smaller.
F/2.8 94 degree Field of view for the P4
1:2. 8-11 24mm on the P4Pro
Since I repair these cams all the time, Starz gave a good visual difference and the others become visible after it is removed from the drone body. The Pro has one wide, flat ribbon connector & the Std. has 2 connectors, one narrow flat ribbon & one 4-wire, short power connector. There are several other differences between the 2 cams that make most aluminum parts not interchangeable, like yaw & roll arms. Yaw & roll motors are the same, pitch motors are different, but their drums are the same. Ribbon cables are different.