The bent pins allow them to be placed in 3 separate brooves, which in turn allows the pins to be placed as close together as need be. The bending has the affect of lining them up within the same plane, regardless of their placement within the three grooves.

As for interchanging them within grooves, that seems to be a no, assuming you would want all the pins within the same plane. On the 5 pin site I have, the red pins are straight, the single yellow pin bends towards the front of the bow, and the two green bend toward the rear. From looking at their site, it seems you can order all colors with all bend characteristics effectively making them interchangable.

The .019 pins come optionally with the Pro series, and can no longer be purchased with the Hunter.

Fritz