function do_something_after_title() {
  $scr = get_current_screen();
  if ( ($scr->base !== 'post' && $scr->base !== 'page') || $scr->action === 'add' )
    return;
  echo '<h2>After title only for post or page edit screen</h2>';
}

add_action('edit_form_after_title','do_something_after_title');

add_action( 'edit_form_after_title', 'myprefix_edit_form_after_title' );
function myprefix_edit_form_after_title()
{
    global $typenow, $pagenow;
    if( in_array($typenow, array('post', 'page') ) && $pagenow == 'post.php' )
    {
        echo '<h2>This is edit_form_after_title!</h2>';
    }
}

function do_something_after_title($post) {
  if ($post->post_type!== 'post' && $post->post_type !== 'page')
    return;
  echo '<h2>After title only for post or page edit screen</h2>';
}

add_action('edit_form_after_title','do_something_after_title',10,1);