According to apple docs
The identifier you supply with your scheme distinguishes your app from others that declare support for the same scheme.
Although using a reverse DNS string is a best practice, it does not prevent other apps from registering the same scheme and handling the associated links. Use universal links instead of custom URL schemes to define links that are uniquely associated with your website.
So to answer your question adding a url identifier doesn’t change much,but its best to include it,as it is specified by apple.