Hi Woo,
To export a page, you may go to Tools > Export. Here is an article you may refer to with regards to this: https://wpengine.com/support/sync-new-post-and-pages/
Alternatively, you may also try to copy the entire code of the page as such: https://share.getcloudapp.com/mXuY7jEE
Then paste, this code in the page of your preference in your other domain.
Hope this answers your inquiry. Feel free to reach out if you’ll need further assistance with anything else. 🙂