Is the LTI 1.3 context ID equal to the course id?

I have not encountered an LTI 1.3 custom parameter in Moodle for the course ID (similar to Canvas's "Canvas.course.id"), but I noticed that the value within the id field of the "https://purl.imsglobal.org/spec/lti/claim/context" claim of the LTI 1.3 launch appears to equal the id value in my course URL ("/course/view.php?id=2#section-0"). Is this always guaranteed to be the case? Does Moodle have a course ID custom parameter? For additional info, I'm wanting to use the course ID with the API webservice /webservice/rest/server.php with wsfunction=mod_resource_get_resources_by_courses for my courseids[0] body value. Does anyone know if the LTI context ID is guaranteed to equal the id that's expected by this API webservice?