Use value from ACF to populate other fields

Untested, but if I understand you correctly, try something like this:

$results = new WP_Query( array (
    'post_id'      =>  '<id-here>',
    'post_type'    => 'acf-field',  //not necessary, but insurance
    'post_excerpt' => '<custom-field-name>', //not necessary, but insurance
    'meta_query'   => array ( 
        'key'      => '<custom-field-name>',
        )
    )
);