[mb6606]

From a Geometric basis and a Procedural Basis . . .

They both connect Impact Point and Low Point and are on the Plane but not on the Plane Line . . . So what's the difference? Visually one is a curved line and the other is a straight line.
One is for swingers the othr for hitters

How does one incorporate the concept of the Parallel Pivot with these procedures? Angle of Approach the Pivot move cross-line . . . But what about Arc of Approach?
Both hitter and swinger cone into the ball with the right forearm angle of approach. The swingers pivot pulls the club left after impact thus the "ARC". The hitter continues out to right field due to little pivot.
Both locate impact at the inside aft of the ball. But Angle of Approach has the club going "out to right field" . . . what about Arc?
See above - the pivot causes the club head to move left ina n arc.

How would a Swinger using Arc of Approach differ from one Tracing the Plane Line? Is the pivot and delivery different?

Delivery is the same path for hitter and swinger.