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
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
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