Here’s the modified code:

function my_editor_style() {

    switch ($GLOBALS['post']->page_template) {

	case 'page-two-column.php': // Change to your template filename
        add_editor_style('editor-style-two-column.css');
        break;
    default:
        add_editor_style('editor-style.css');
        break;
    }
}

add_action( 'admin_head', 'my_editor_style' );

This is very helpful, but how would you change the editor style for page templates … in my case, the default page width is the same as for posts, but I also have a “full-width” page template that has a different width.

How could I load a different editor style for a page using the “full-width” page template?

I have the same problem.