Replace heading texts on admin single Order pages only in WooCommerce

The following will only target Admin single "edit" (and "new") order pages:

add_filter(  'gettext',  'change_admin_single_order_heading3', 10, 3 );add_filter(  'ngettext',  'change_admin_single_order_heading3', 10, 3 );function change_admin_single_order_heading3( $translated, $text, $domain  ) {    global $pagenow;    if ( is_admin() && ( ( $pagenow === 'post.php' && isset($_GET['post']) && get_post_type($_GET['post']) === 'shop_order' )    || ( $pagenow === 'post-new.php' && isset($_GET['post-type']) && $_GET['post-type'] === 'shop_order' ) ) ) {        if( $text === 'Billing' && $domain === 'woocommerce' ){            $translated = esc_html__( 'Sender Information', $domain );        }        if( $text === 'Shipping' && $domain === 'woocommerce' ){            $translated = esc_html__( 'Recipient Information', $domain );        }        // Addition asked in your comment        if( $text === 'Shipping:' && $domain === 'woocommerce' ){            $translated = esc_html__( 'Some text', $domain );        }    }    return $translated;}

Code goes in function.php file of your active child theme (or active theme). Tested and works.