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One major that happens a lot when a site changes domain names is that someone forgets to set up 301 redirects from the pages on the old domain to the pages on the new domain.
If you have a website, typically over time it will begin to build authority with Google, create a reputation and gain backlinks. If you change domain names and don’t take the proper steps, most likely the new domain will not rank as well as the old domain.
This can also result in website traffic drops, a reduction in link juice being passed to the domain and a poor user experience.
Besides performing a “change of address” in Google Search Console, you will want to set up 301 redirects from the old domain to the new domain. When I say this, I do not mean redirect all pages from the old domain to the home page of the new domain. Do not do this. You should set up one-to-one redirects, not wildcard redirects.
old-domain.com/contact-us/ 301s to new-domain.com/contact/
old-domain.com/about-us/ 301s to new-domain.com/about/
old-domain.com/news/ 301s to new-domain.com/blog/
This is very tedious but it’s a very necessary step so make sure to set aside enough time for this.
Make a copy of this template. [not sure how to do that?] Paste all old URLs into Column A. Find the correlating page on the new domain and past that into Column B.
There are at least three things you can try.
Go on Google and type this into the search bar without quotes: “site:old-domain.com”. This will show you all pages that Google has indexed from the old domain. You can copy and paste all the results into a Google Sheet, sort and remove extra rows. Or you can extract this data with a number of tools. This will give you a list of many of the old URLs.
The other option is to use a tool like Ahrefs. Add the old domain, go to the “Best By Links” report and filter for pages that 404. You can export this list which will have many of the URLs from the old domain in it.
You can find archived URLs from Wayback Machine using this awesome Google Sheet. Check out the guide here: https://www.thetechseo.com/seo-tools/discover-lost-urls/
Of course these three options won’t show you all pages but it will help you to recover most of the data you need if the old URLs have already been done away with.
Further Reading: https://support.google.com/webmasters/answer/6033049?hl=en