Here's a Brabus VIN from Craig's List: WMEEJ31X59K251101
It appears to match up with the normal smart VINs:
WM = World Manufacturer (?)
E = smart
E = 451
J = coupe (pure, passion or Brabus the same) ? or
K = cabriolet (passion or Brabus the same) ?
31 = 70 HP N/A engine
X = passive restraints
= checksum (accuracy check) any digit 0-9 or X
9 = year (2009 example 9)
K = assembly building K, = Hambach, France
The next six numbers = the build sequence or serial number
So there doesn't appear to be a special Brabus code in the VIN.