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Each course you publish will have its own unique link. If you share one link with two customers, both customers will see each other's comments.

If you send each customer a unique link to a course (even if the same course is published twice) then your customers won't see the comments on the other course. 

To publish the same Rise course to Review, you'll need to first duplicate the course. This gives you two versions of the course. It's a good idea to give each course a unique name to make it easier to know which course to share with each customer.