Are you looking to share an individual page to another account?
You can do this by setting up the page as its own site design, then sharing your single page site design with the other account.
Step 1: Add a Blank Site Design
First, add a blank site design to your library
Here is the blank template Share Key: jWAPPvAagQ6x38940 (install steps)
Step 2: Add Your Page to the Design
Once you have added a blank site design you can rename it something that makes sense for your page. Then you can add the desired page to the new blank design.
Step 3: Generate a Share Key
Now that you have a site design that is just the page you want to share, you can generate a Share Key so share this page with someone.