Can I remove # Options FollowSymLinks from the htaccess?

I cloned my old domain and moved to a new domain. So the pages and post were the same title and content. I thought the best practice was to drop in the following code to show Google the site pages moved to a new domain:

Options +FollowSymLinks
RewriteEngine on RewriteCond %{REQUEST_URI} !/googlea01xxxx727xxxx.html/?$ RewriteRule (.*) https://newdomain.com/$1 [R=301,L]

Now I have learnt I should have done a page by page 301 redirect. Can I remove the above code and put the individual 301 redirects in the htaccess instead?

I also don’t want the old domain shown in the serps so do I need to drop in: Header set X-Robots-Tag “noindex, nofollow”