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Different compilers will generate different compiled code, even on identical input (ie, clang vs. GCC). So the binary will be different.

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I think he's commenting on why they wouldn't LOOK identical, as in UI.

UI is a finicky thing, but assuming this allows you to use all Apple APIs, there is no reason you couldn't get an identical-looking UI using this.

I'm fairly sure that section is talking about compiled code, structure of the app, the archive, etc, considering it says "compiled ahead-of-time, never interpreted, and you access the entire set of iOS public APIs." the previous paragraph.

You're right though, there's no reason the UI wouldn't look identical as well.

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