Product Owner's Role In Scrum Same Or Different As Compared To A Project Manager's?

Hi, I'm new to Scrum. I am searching for the exact difference between the role of a Project Manager in traditional development methodology and that of a Product Owner in Scrum. Both overlook the project and are responsible for it. Both manage people. Are both the roles fundamentally same? If not what is the main difference between them? Is a PO role very different from a PM's?

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