The rep Breitling and the rep Flat Six DON'T use the same movement as the gen at all. The movement just has the same subdial layout but different functions on the subdials. The left subdial on the gen counts 12 hours for the chrono and counts the chrono minutes from the center. So there are two chrono hands in the center.
Not only would the gen 12 hour hour, 1/10th seconds ETA chrono be a much better movement than the 30 minutes, 1/10th ETA chronos they use in the reps, but the movements used by Breitling do have modded/exchanged controllers and have thermocompensation so they pass the Superquartz test, similar to the chronometer test..
That said, It would be possible to make 1:1 reps of the Breitling Aerospace and the analog chronos like the Seawolf chrono or the chrono avenger M1, etc by using the stock unmodded ana digi/ 12 hours ETA chronos. Probably not going to be as accurate as the Breitling SQ movements but I guess it wont matter much to the most if the movement loses 5 seconds or 10 seconds a year.