While a communications calendar is helpful for showing what will be communicated, when, on what channels, and by whom, an editorial calendar is often helpful to use alongside your communications calendar. An editorial calendar breaks down how each communication piece will be created. For example, if a blog post is one of the communication events on the calendar, there is a process that will occur to write the blog, gather accompanying images for it, and publish the blog. The communications calendar would show the finalised blog post and when it will be published as well as the social media posts that will promote it. However, the editorial calendar would show steps for getting the blog ready to publish.
Keeping editorial and communications calendars separate results in cleaner and more user-friendly documents. These calendars should always be coordinated, though. For example, a blog post should never be placed on a date on the communications calendar that is prior to when it is set to be finalised on the editorial calendar.