[Sergio Luis dos Santos]

Almost all badges can be seen with minor variations. We can´t talk about an "official" pattern. Doing a photographic research you can notice several badges where modified during their "operationa life". Just notice a good amount was done by free hand. Few ones where aplied with decals or similar way. Most consistent shape are found on the ones done using masks.
Variations happens in other air forces also. Brazilian´s Senta a Pua! in Italy was done by hand so you can find differences almost in all them!
Anyway, photographic proof is your way to avoid mistakes instead based in published drawings only.