Considering AMC has never been sold in Australia i don't see how you could even get to that conclusion.
Mopar? AFAIK they have never developed a car in their own right. They are a parts and performance arm of Chrysler.
The car in question, the V8 Interceptor or Super Pursuit was a 1973 Ford Falcon GT351 Coupe. Designed and built here in Aust the GT's were at the very front of the Aussie muscle car scene. The Falcon has been designed an built here since '72 if my Aussie Muscle car knowledge is correct, and it is. (If anything they resemble the 1970's Fastback Mustang's more then anything from AMC, though i guess the AMX does have a slight resemblance.)
The Interceptor is the Hardtop version
In fact an earlier 71 model GTHO Falcon held the record as worlds fastest 4 door sedan for nearly a decade.
For US fans of the original movie, be sure to see the Oz version without the US over dubbing of the character voices and the elimination of the Aussie slang used throughout the movie.
You won't regret it.
Amc and Mopar indeed....