Disagree Shane, i could be mistaken but around 25 years ago i lived and breathed Ford muscle cars. the SA cars had a low spec engine and they were Fairmonts not Falcons. Besides the obvious differences in the compliance plate prefix MS33 and not JG33 experts will pick flaws in the panel work with 2nd rate welds and gaps between panels.
I would have to get some old mags out of storage to justify my statement as I am relying on my memory.
I have tried to forget most stuff I know about Ford over the last 25 years.

I thought JG/JH was Melb/Bris plant and MS S.A. export. 33 GT, 35 F/mont. ?
Anyhoo, same vehicle sent to SA bar the trim. Both 54H body shells. Both 351 4V, not HO spec though. The Australian built car is of F/mont spec in reality, sold as a Falcon. Sold as F/mont in S.A. Same car different trim, gauges and glass.
Same as the HT monaro. All 350, 10 bolt, GTS spec cars (Except transmission) exported and sold as Chevy SS.
Pretty sure that's close to being right

Shane.