What is contained within the two fundamental sets?
Fundamentals of Marksmanship
Grip (usally two handed using some form of isometric tension, Weaver front and rear, Iso side to side)
Stance (Weaver, Iso, or Modern Iso)
Breathing (using the respiratory pause)
Sight Alignment (hard focus on the front sight)
Sight Picture (flash sight picture)
Trigger Control (compressed surprise break)
Follow Through (two sight pictures for every shot taken)
Trigger Reset (do not let finger fly off of the trigger, do not allow slack back into the trigger
This is all about making the hit. It does not account for not being hit.
There is a balance "to hit and to not be hit"
Fundamentals of Combat Shooting
Grip (usually one handed using some form of convulsive grip or death grip, which is perfect for the typical physiological response when somebody is trying to kill you. One hand on the handgun allows for the other hand to be used in an athletic manner)
Stance (What stance! Athletic movement based "do not get shot" lowered base "combat crouch"
Breathing (we are going to be breathing and the adversary is not going to be breathing for long)
Sight Alignment (we probably won't have the luxury of the sights when we are behind in the reactionary curve, in low light, with both adversaries dynamically moving, within the activation of the sympathetic nervous system, inside of typical handgunfighting distance.......especially when the majority are from 0-5 feet)
Sight picture (hard focus right at the spot on the adversary that we want our bullets to go. "The bullets go where the eyes go."
Trigger control (press straight to the rear as fast as you possibly can, dictated by the distance. All while using the convulsive grip to keep you on the targeted area as you make the handgun sound like a machine gun out of a one handed grip.)
Follow Through (the convulsive grip gets you back on target as you recover from recoil. It is a kinesthetic follow through.....not a visual one.
Trigger Reset (maybe.....maybe not.....depending on which is faster for you out of your convulsive grip)
This is all about the balance "to hit and to not be hit."
One is competiton based and one is combat based. One does not take the dynamics of the fight into consideration and the other is all about the dynamics of a fight.