per........................... well i admit to not being the good looking one on the right :
im the 150lb fat bastd
hammer fixings and frame fixings are similar but different, your link is accurate
both have a steel "screw" and an integeral rawl plug
you use hammer fixings for battens and stuff, frame fixings for door and window frames
the frame fixings do not pull the frame into or out of shape
clearly the first is hammer fixed (but can be removed by screwdriver) frame fixings are generally larger than hammer fixings and have PZ3 or PZ4 heads
for UPVC frames you cap the screws with a plastic cover (also supplied)