Hi Anzz,
I always thought the Model type (i.e. SE, Sport, AMG Sport, Engineered by AMG) gave rise to any visual difference such as trim, vents, body kit, alloys, brake callipers.
I thought the A180/A200/A220 was linked to what was under the bonnet and reflective of the size of the engine.
I could be wrong, but i'm sure there is no visual difference between the A180 and A200 if both are the AMG Sport model other than the model badge on the boot.