All with cathedral hands, similar font, etc.
My initial question was about whether a common ancestor would be traceable, but I found the answer here:
Pilot’s watches of this style were not exclusive to Zenith, in fact, this style of watch was generic for the period from the early 1900s to the thirties. Similar watches were made by Longines, Omega and Helvetia. Aviator’s chronographs were also made in this generic style, but curiously none had military markings unlike later such watches.
(If you know anything to the contrary, shout -- I haven't done a proper research).
(Also, not sure about the aviation part, because when I look for example at the Sowar, I see more of a field watch in it).
Any other modern iterations of these that you know of? Pics welcome!