Ian,
I've just had a quick look at disposals data I have (very incomplete!) in an effort to try and locate your particular Brit reg. There are a few 'Z' prefix registrations in the right weight class disposed of in 1944, but none that match your Brit registration exactly.
Unless you can find evidence of an Australian registration on the bonnet sides, then I'd suggest your truck retained its Brit registration while in Aust Service.
Mike C
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