I don't know.. I don't think some of these car's "rip offs" of an Australian brand..
I think that Holden GTS looks more like a late 1960's Chevy Nova. Or is it the other way around? The GTS even looks like it has the back half off of a later model Duster. I don't know much about AUS car brands. But I did watch the movie Love The Beast staring Eric Bana. Which was sick. And watching the V8 super car's is cool too. Both of these car are cool

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GTS

Nova

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The body lines are vary similar. I don't know which body style came out first. I think it was more just the style of the time period. But don't these two share the same GM motors? IDK...