You won't see the difference but the functionality and selection are different. Com is better than. com.au but much isn't shipped to Australia.
Plus,
Have spent thousands with them over about twenty years.
Their returns and refunds are inflexible. I have a brain injury so often just take the loss. Once they refunded $10 for a late cable.
But they twisted and rejected my claim for a car cover $170 not as described and months late. Their own system even said it was not delivered.
No integrity.