The 2014 Oz-built Cruze is close to the Gen1 US-built Cruze, but it's not identical.
It's a Series II JH, the 1.4l and 1.8l engines are essentially the same as in the US-built Cruze, but the diesel is a completely different engine.
I am not sure about the gearboxes, they may be the same.
I
know the headlight globes are different, ours work a lot better.
Some of the dimensions of things are different, for example the JH headlights are taller than the US-build.
The ECUs are programmed completely differently, but the petrol ones can be tuned the same, I gather.
And so on...
