Those are suspiciously convenient examples. A more relevant comparison would be: Los Angeles is closer to Tijuana than London is to Paris.
Here is a map with London and Istanbul on it. In between them are many countries with at least six majority languages (and that's a low count, where some people would lynch me for saying that their language is the same as the one their neighbor speaks). Los Angeles and Tijuana on the other hand are two cities right by a border, and the only languages commonly spoken between them is English, the language of the USA, and Spanish, the language of Mexico.
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