The two standards have a common structure. Many clauses have the same number and name, what is different is the scope. In a certain way, and I’m not an expert in ISO 22301, ISO 22301 handles with detail a particular risk that can be determined while preparing a quality management system according to ISO 9001:2015. If your organization already has implemented a ISO 22301 at least you already know what most of the topics are about, as I wrote before, the difference is in the scope and detail for normal operation.
The following material will provide you more information: