301 redirection to achieve access after changing the domain name

If a website has two domain names: domain1.com and domain2.com. In the early stage of website operation, domain1.com is mainly promoted. However, in the middle stage, due to brand or product positioning reasons, domain1.com is no longer suitable for the current situation and needs to be replaced with domain2.com.
As an SEO, we definitely recommend using 301 redirects. When users visit domain1.com, they are automatically directed to the new domain name domain2.com. 301 redirects can be achieved through programs or domain name redirects, so that the old domain name PR can be transferred to the new domain name.
However, if the user has bookmarked a content page of the old domain name (for example: domain1.com/content/20080808.html), being directed to the domain2.com homepage through domain name redirection may result in a poor user experience, especially for users who have not been informed of the domain name change in a timely manner. The best way is to implement wildcarding and dynamically redirect an internal page of the old domain name to the URL of the same page of the new domain name. So how can we use technical means to implement a 301 redirect between the new and old internal page URLs? ? ?
That is: jump from domain1.com/content/20080808.html to domain2.com/content/20080808.html, and make the browser return a 301 code
Implementation method under PHP (reference):
The .htaccess file code is as follows:

Options +FollowSymlinks
RewriteEngine on
rewritecond %{http_host} ^www.domain1.com [nc]
rewriterule ^(.*)$ http://www.domain2.com/$1 [r=301,nc]