Difference between MultiPlus-II 48/5000/70-50 230V and MultiPlus-II 48/5000/35-32 230V AU (AS4777-2 2020)

Hi all
I was wondering if there are any mechanical/electrical differences between the MultiPlus-II 48/5000/35-32 230V AU (AS4777-2 2020) and the MultiPlus-II 48/5000/35-32 230V inverters.
The AU version is certified to be directly connected to the grid in AU/NZ while the non-AU version cannot. Is this a physical difference between the two units or just a firmware change? If it is a physical difference, can this be retrofitted?