htaccess 301 for new page name across all subdomains

I’m running a WordPress multisite network with multiple sites across subdomains. I need to change the url of a page that is copied across all of them and setup redirect for the old URL.

Examples:
xyz.site.com/about-our-group redirect to xyz.site.com/about
abc.site.com/about-our-group redirect to abc.site.com/about

How can I achieve this in my .htaccess file?