@Fenreliania variants of Weetbix (Weetabix) exist in the UK and Milo is a brand in the UK and US and I'm pretty sure I've seen it in Europe too.
I think the brands-as-identity thing might just be the way that imperialist colonies naturally work, as apposed to something that's Australia specific. There's not a lot else to work with under capitalism when you don't have a particularly long history away from the country(s) of origin.
@Fenreliania America seems as different as it does mostly due to mass brainwashing and it being a combination of several discrete european imperial powers rather than just one