I've heard that it's common to use the phrase "fish and chips" to distinguish between Australians and New Zealanders.

Had no idea, but I found an example now, thank you!

For anyone else who wants to hear this difference:

https://m.youtube.com/watch?v=XKuPfZpzEHg

It almost appears as if they were referring to the American alternatives, Aluminum and fries.

I'd have thought the accents argument would apply to any location, Germany included.

German dialects are rarely written and if they are they are written different from Standard German. The written German language is very phonetic and if you know the rules you know exactly how a word is supposed to be pronounced.