Yes, but you have two examples (unversioned and versioned) with the same url!

> The CKAN APIs are versioned. If you make a request to an API URL without a version number, CKAN will choose the latest version of the API:
>
> http://demo.ckan.org/api/3/action/package_list
>
> Alternatively, you can specify the desired API version number in the URL that you request:
>
> http://demo.ckan.org/api/3/action/package_list
>
> Version 3 is currently the only version of the Action API.