What are the different versions of the same (according to the circuit picture) citcuit layouts? Different ads? Different grip settings of the track (I don't think it's this but this is easily possible to do and would be really cool)? Different trackside objects, ads, textures, etc. replicating a particular series' weekend? Different graphics in other ways (track lighting values, colour values, rubbered-in lines, etc.)? Different bumps or other physical differences which make a difference to driving? Or...? These seemingly identical circuits include a pair of Interlagos circuits as-well as a pair of Brasilia circuits. There is at-least one more pair if I recall correctly.