Nope. I'd state that jza70 and ma70 (for all intents and purposes as far as Vicroads are concerned) are the same model. This chap has two options:
If his supra is registered at present, do the 1j conversion then fill in an engine conversion form and hand the form in to Vicroads. That's the easy way.
If his supra isn't registered, do the 1j conversion, get a rwc (assuming the car is otherwise vaguely roadworthy the engine won't matter, not that it should), then present to Vicroads for a desk jockey to inspect the numbers and register it.
edit: It doesn't matter if the car's aussie delivered or not. Check the VSI. Victorian blokes, read the VSIs and print them out and memorise them. If you're a modified car owner, they'll come in handy someday.
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