Suggesting a unique failure pattern for one of these hinges demands a similar artifact in the other. If inadvertent, it was repeated in its partner, quite unlikely.
By the same token, similar breaks in mirrored parts suggests rather strongly a shared defect, and most likely in design. A separate though similar component failing in virtually the same way, right?
As said earlier, from the photos available IMO there were two different failure modes for the two parts, one fatigue, one overload. If we had the parts (or better photos) my theory could be proven.
The outstanding question, where is the aileron? In the Lake? We know they float.
The aileron is still attached to the wing, by the hinges and the other actuator/s.