Kinda sorta but not completely.
Under stress, most people tend to shoot at a cadence set by feel rather than sight. As such, if your "cadence" has been trained to be faster than you can get good hits with your carry gun, there's a chance your accuracy will suffer even more than normal under stress. This won't much matter at close ranges but we can't choose the range of a fight.
I
definitely disagree about the trigger action thing, though. A lot of it will depend on what you're used to compared to what you're shooting at the moment of truth, but there are certainly combinations which won't work well. The most obvious is someone used to shooting, say, a Glock and then drawing a 1911 under stress. Would you disagree that there's a higher likelihood of fumbling or forgetting the thumb safety?
You don't need life-or-death stress to demonstrate this. Put a little stress on people during a battlefield pickup drill and you'll see it.
I remember years ago being at a match shooting a Beretta I'd just converted from DAO to DA/SA. No problems on the first couple of stages but then we had a "bump" stage ... you were in a fairly small waist-high box and an RO was standing next to and just behind you, bumping into you as you shot. Under that (relatively minor) stress, my finger was waiting for the trigger to move all the way forward before I could fire another round ... which it wasn't going to do, because it stopped at the SA reset point. I tapped, racked, my finger went back to where I expected the trigger to be ... still no good ... tap, rack ... still no good ... lock, rip, work, tap, rack ... still no good ... stare at the gun ... see the safety lever on the slide, remember "oh yeah it's DA/SA" ... get laughed at for weeks by friends ...
Please don't misunderstand, I'm not saying that someone carrying a .45 Commander is going to die in a hail of bullets because he normally practices with a 5" 9mm. But the farther away your carry gear gets from your training, the harder things will be when under stress you default to that training.
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