Search is a bit dodgy at the moment as you can only search by title, so well forgive you this time.
Im pretty sure he means the difference between a cup and a std 172, so here goes anyway
uprated, slightly lower and wider suspension
Thinner glass
Removal of:
ABS
ESP (I think)
Xenons
Sound deadening matting
Spare wheel
No Leather
Rear bench seat rather than normal split seats
Different colours (Blue and silver)
Different Alloys
All in all, a completely different car really. 172 is for speed, comfort and nice extras and the Cup is for stripped out, track style action, no toys and requires more involvement.
Personally, i went for the 172 as i wanted a quick car with nice toys.