Are any parts on the AU falcon the same part as any off a US ford model. It's just that I can get American ford stuff off the shelf in the UK where as OZ parts cost a small fortune to post here. Mainly interested in suspension & drivetrain parts. I don't have access to part numbers so cannot compare

I believe that very little is interchangable. A few sensors etc.

You need part numbers. If the numbers are different, then they will not fit.
About the only bits that you can get from the USA is T5 manual g'box parts.
And the Saginaw power steering pump parts......maybe some sensors as suggested before.
If it is a V8, yes you can get bits from the States for them.