A very simple experiment…
add_action('admin_init','get_header');
add_action('admin_init','get_footer');
… will demonstrate that the get_header() and get_footer() functions work on the back end as well as the front, though you will need to adjust for numerous markup problems and other issues.
Honestly, you question seems to be “how do I get the site header and footer and use it in the admin area?” but you don’t say how you want to use it, or why. Those are important considerations. As demonstrated, the “getting” is easy.
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