Steve,
The screens are the same but the Homebush is raked back more than the CR. Also the bodies are different, the Homebush is "thinner" than the CR.Brian at Homebush use to make the bodies for CR but they are obviously different moulds. Which one is closer to the "original" I have no idea.
The Homebush body would need more work before painting than the CR but this is not a big deal.
Probably worth attending a few NSW Cobra meetings before you decide. I was surprised at the different shapes when I went to the Skid pan day.
Either way you go your in for a blast.
Phil