New answers tagged migration
You can use the domain A right now if you want. The only issue you can think about is URLs which already existed on your old site on domain A because users could be redirected to the domain B. Make sure you don't have duplicated URLs between your new site and the old one on the domain A.
In an .htaccess file you could specify the following: RewriteEngine on RewriteRule ^(.*)$ http://www.example.eu/$1 [R=301,L]
If possible, try to use only one 301 redirection. 301 redirects transfer SEO juice, but you lose a part of it for every one of them (around 10-15%). You should make a rule to redirect specific cases first, like: example.it/index.php?id=10&link=slug (301 redirect to) -> example.eu/c10/slug... Then, if none of these rules are triggered, you should apply ...
Any change will have any impact. Expect about a 10% change or less if you have good rules.
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