The front chop on the Coke Stang makes it unique, as the US TransAm cars had some of the metal replaced, so it represents the "purest" iteration of the 1969 TransAm Mustang They originally took a 2" wedge cut out to drop the nose, but had to put 1" back on the US cars.
I believe that Bob Jane's Trana, which was used to great effect by Haberfield Fats - while stamped as GMP&A shells - werw a different batch to the LeMans shells - one of which ended up as a Janson/Perkins car... The Jane/Geoghegan car was, in unofficial practice, three seconds quicker than the eventual pole time at Bathurst in 1977, before succumbing to a series of oil filter prob's.