How to set up new account when double porting?

I’m porting from lebara to payg sim the back to lebara on a new customer deal.
As I’m already a lebara customer how do I set up a new account for my new lebara sim? Can I just use my existing account but delete current number and add the new lebara number when my lebara sim arrives. Or what about changing emails as new and existing lebara sims are linked to thI could change one of them. Or do I need to deactivate existing account and set up a new one.