Different stylesheets for different templates – after enquing parent stylesheet

Hi,
I want to use a different stylesheet on a page with a different page-template. The top of my functions.php file looks like this:

if ( !function_exists( 'chld_thm_cfg_parent_css' ) ):
function chld_thm_cfg_parent_css() {
wp_enqueue_style( 'chld_thm_cfg_parent', trailingslashit( get_template_directory_uri() ) . 'style.css' );
}
endif;
add_action( 'wp_enqueue_scripts', 'chld_thm_cfg_parent_css' );

// END ENQUEUE PARENT ACTION

function lander_work_script() {
if ( is_page_template('page-templates/page_prevdefault.php') ) {
wp_enqueue_style( 'lander-work-style', get_stylesheet_directory_uri() . '/prevdefault.css');
}
}

add_action('wp_enqueue_scripts', 'lander_work_script');

But when I use the template prevdefault the stylesheet style.css is still being used in stead of prevdefault.css.

Any ideas why this is… I guess something to do with the order of the enqueuing? I am pretty new to wordpress though and would appreciate any advice. Thanks