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Best way to create a multi-regional site

I need help on how to best duplicate our site for a second country. Our current website is for the New Zealand market and has a .co.nz domain. The site is in English.

We want to launch a second website in Australia with similar but not identical content under a different domain .com.au

What is the best way to go about this in Webflow.
Duplicate the site and have a separate 2nd site?
What do we need to do to ensure we don’t have duplicate content issues for SEO?

Or should we add a 2nd domain to the original project and then somehow display unique content, where required, for each country?