For Mustang/Cougar 70 version is virtually identical to the 69 version even though the part numbers are different.
Yes. For 1970, some versions of the controller has a piece of tape with "D0ZE-" stamped on it covering up the C9ZE-### number.
Inside, I have observed that a buss bar has been soldered onto the caps of the fuse that was installed on the circuit board. Buss bar is about the thickness of a paperclip.
Lots of 1969 control boxes do not work due to the blown fuse.