Hreflang Tags Help
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Yes, you should use Hreflang tags. If you do not, it's a duplicate site.
However, even if you use hreflang Google might still consider them duplicate sites if the content is exactly the same. See this thread: https://moz.com/community/q/hreflang-problem
So you should try to localize the content so that it's really unique for each market/site.
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If you use the hreflang, Google won't consider the alternate URLs as duplicate ever ;-).
However, working on localization is needed in order to have more chances to rank better, and offer better UX.
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"If you use the hreflang, Google won't consider the alternate URLs as duplicate ever ;-)."
I wish that was true. That would solve a lot of the .co.uk vs. .com problems that sites have where they want a different URL to show up in the SERPs without actually having to change their English content. But the reality is Google will consider it duplicate content even if you use hreflang. I have blogged about this in detail with examples: https://hreflang.org/hreflang-and-duplicate-content/