Business Continuity and Risk Management

What is the relationship between Business Continuity and Risk Management?
The relationship between Business Continuity and Risk Management depends on the organization. In most cases, Business Continuity is a sub-domain of Risk Management.

If there is an existing Enterprise Risk Management framework in the organization, can you use that in your Business Continuity Planning? Or, should you create a new Risk Register and new Risk Assessments for each department inside the Business Continuity Plan?

You should refer to your organizational Risk Register as a starting point. However, some Business Continuity Plans may contain lower level risks that are important to the department but not significant to the organization as a whole
Risk Management is focused on the mitigation of issues and Business Continuity is more concerned about a worst case scenario action plan.

https://www.bcpbuilder.com/2018/11/21/business-continuity-risk-management/