iOS integration - canShow versus canShowAds

So what is the difference between canShow and canShowAds?

When would you use one versus the other?

They always seem to return the same thing (either both true or both false).

Copied from the Unity Ads iOS SDK Integration Docs:

Keep in mind, you won’t need to use these methods if you’re doing your integration within a Unity project. If you are, please see the integration docs for the Unity Ads Asset Store package.

As the title of my question says, this is for “iOS Integration”, so yes I do need to use these methods.

Thanks