Allow Duplicate customer while creating package via clone API

We are using Rest API for creating packages out of templates.

We have scenario where we have two roles one is customer and another is Guarantor. They are mapped in template. On UI , we allow user to enter name , email address and mobile number of signer for Customer and Guarantor role and then we clone package through Rest API using selected template by user. Now if same name and email combination is entered for signers then it gets rejected by Onespan. We have scenario in which Customers can be Guarantor too. So we want to allow duplicate name and email addresses for signer. Is that possible ? If yes then How ?