.htaccess redirection

RewriteCond %{HTTP_HOST} ^url.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.url.com$
RewriteRule ^dir$ "url2.com" [R=301,L]

When I open url.com/dir now, it shows up url2.com in the browser line. But I want that it redirects to url2.com but keeps showing url.com/dir in browser line, url2.com should be "hidden".

Is that possible?

>>2 here
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