Can you export/share a confluence page to another confluence server?

[Alex Medved _ConfiForms_]

You can also try to use our plugin, https://marketplace.atlassian.com/plugins/com.vertuna.confluence.plugins.confirest to include your content from one Confluence into another in realtime (without exporting/importing). 

Basically plugin acts as a proxy, allowing you to include the structured and unstructured content from any web service. Handles transparently the authentication details when necessary

[AnnWorley]

Yes, you can export the page to XML and then upload it to another instance. The instances need to be the same major version. More details in this article: https://confluence.atlassian.com/display/DOC/Exporting+Confluence+Pages+and+Spaces+to+XML