Save an array from drop-down in custom meta box

Quite simple. Instead of saving the post title, save the post ID, so in the front end you can extract all necessary info.
Like so: get_post( $the_saved_ID_value ); or get_permalink( $the_saved_ID_value );.

In you code, change this line:

echo '<option value="'.get_the_ID().'" '.$is_selected.'>'.get_the_title().'</option>';

Notes:

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