They are indeed separate. They both share the same core system but the data in the databases is quite different. This data includes things like your username and password. So feel free to use the same username and even password if you're so inclined but you're going to have to create a new account. Hope this helps...

In the future questions like this should be posted in the Perl Monks Discussion which discusses site issues as opposed to Perl questions which go in Seekers of Perl Wisdom