It is always best to share the batch code to get a correct answer. The batch code is the series of letters and numbers in brackets after the project title.
If it is one birth certificate, with the name variation then you would use or in the given name field.
Given Name: Vincenzo or Vincenso
They are either the same person as the town and birthdates are the same. one is vincenzo and they other is vincenso. Both names are the same date and same birth certificate.