Backup Restore fails if we use same name as source db pod

@dosu
I am using CNPG 1.26 with Barman Plugin 0.11.0 on ak8s.

I taken the backup of one of DB cluster on azure blob stoarage.

I restore db with different name from that backup and it worked.

Now i deleted that original db . tried to restore db from backup with same db cluster name and it is failing. why we cannot use same db name.