Role - Prescribed or expected behavior associated with a particular position or status in a group or organization.
Designation - nomination, appointment, or election to an office, position, etc.
In many IT companies I have seen designations and roles as totally mismatch. So someone being called as an Architect does no different work from a developer. And sometimes Leads act as managers, and managers just act as project coordinators. This often leads to confusions among what is expected from people, and what are their goals.
It's also important to understand that ROLE PRECEDES DESIGNATION. So if you are a lead aspiring to become a manager, in addition to your responsibilities, you need to get into the role of your manager. Start doing and understanding the nuances of being a manager.