Nick
Not only true on the Cobra but the various models of the Huey. The difference between the UH-1 M (204) and the UH-1H (205) was so critical that folks had to be checked out to drive the UH-1M for things other than gun missions at High DAs. Major difference was a shorter tailboom on the M Model. I remember it well and as a Unit Trainer made sure those hot dogs flying M's were well aware that the reason for the Left Pedal smashing through the chin bubble meant you were too high, too hot and fast coming into a mountainous LZ. Next was the aircraft spinning when ETL was completely lost.
Not that it matters, but lots of folks dont know that the Military Huey (UH-1D, H, V etc) has the tail rotor on the left side, wheras the Civilian 205 has a larger corded one on the right side. Much better.