Security Role migrations: Overriding with new privileges/security profiles

Summary

Created a new job role and trying to migrate in other environment but it is not removing the existing privileges in destination pod. Is there a way to override the existing role in destination?

Content

In source(POD -A) we have created new custom employee role with 15 privileges, now we have to migrate this to POD-B. In POD-B custom employee role has 20 privileges, now expectation is when we migrate the new custom employee role to POD-B , we should see only 15 privileges but we are seeing 20. Is it expected behavior?