What is the difference between HCM role structure vs ERP role structure

Summary:

Just want to ask, what is the difference between the HCM role structure vs the ERP role structure? From what I know, ERP roles are called job roles and each job roles have corresponding privileges and duty roles. The job roles are then assigned with data security context values which defines the data set that a user is permitted to access. Is it the same with HCM roles? What is the difference between a data role and a job role?

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