The overall shape of the dash is the same, but you can tell the difference between the Mexican, American, and German MK II Dash.
1) The American dash has contoured edges, but a strange dash bezel insert and speaker covers.
2) The German dash has contoured edges and a 'normal' dash bezel insert
3) The Mexican dash has sharper edges around the perimeters (like the side edges, around the dash, etc.).
Parts (dash bezel, speaker covers, etc) are interchangeable and identical between the German and Mexican dash, but neither is interchangeable with the American dash.
Most "purists" prefer the German dash, since the American dash is retarded and the Mexican dash is slightly goofy looking.