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Outside the US? Then you’ll be getting worse versions of the Google Pixel 8 and iPhone 15
(www.techradar.com)
This is a most excellent place for technology news and articles.
There were examples when the same phone was released with different hardware in different regions, but it's not mentioned in the article...
E.g. in 2022, Samsung S22 European version had Exynos 2200 SOC, while in other regions it had Snapdragon 8 Gen 1, IIRC there were some performance differences between them.
Hasn't Samsung done that for a while?
For S23 there is only one Worldwide version with Snapdragon. They had separate versions since S7.
Since the S7? Not at all - they've been doing that much earlier. The Galaxy Note 3 was Exynos based in India and some other regions, but Snapdragon based in the US and Europe.
It's been a common thing for years from all major phone manufacturers, as far as I know. It was the reason I careful when buying a One Plus 7 Pro back in the day.