I think the only benefit is that you get to keep your reserved seat (unless you were GA). Unless someone else here knows otherwise.
Do a quick search on your emails and see if you can find your login, otherwise I don't see any harm in signing up as a new member.
Hmm my membership was tied to an email account which is inactive now/have no way of accessing it. I could call up the membership number and change it, but if you say there's no different for a GA member to sign up again I'll take your word cheers mate