Whatever is the easiest descriptor in context. Kamala has a unique first name in politics, "Harris" is not. Hillary differentiates her from Bill, however you definitely could use either if trump is in context.
I'd actually say that Finland is closer to Greece than Orange County is to like Trimble, but I haven't spent much time in Finland outside of Helsinki and Enontekio. But the point isn't who has the most different, it's "is EU to US a more apt comparison than any individual European country is to the US?"
Netherlands and Poland would have been a better example for you to bring up than Greece and Finland honestly.
Whatever is the easiest descriptor in context. Kamala has a unique first name in politics, "Harris" is not. Hillary differentiates her from Bill, however you definitely could use either if trump is in context.