Noether of those are Cloud.
If you visit either of them, you'll find there is a "help" icon towards the top right, and that leads to a list of options that contains an "about Confluence" which will give you a version number.
Cloud systems won't give you a version (it's functionally useless to you) if you hit the "about" link.
But, I can tell you that both of those systems are Server or DC because of their URLs. Until Atlassian implement the feature well known as CLOUD-6999, all Atlassian Cloud systems live on <something>.atlassian.net If it's not atlassian.net, then it's a server or DC install.