Override theme style with other CSS on a specific page

You want the plugins style sheet to over ride your themes style sheet conditionally ( on one page).

Dequeue your themes style sheet for a specific page conditionally.

add_action( 'wp_enqueue_scripts', 'remove_default_stylesheet', 25 );

function remove_default_stylesheet() {

if ( is_page( page id or slug) ) {

wp_dequeue_style( 'original-enqueue-stylesheet-handle' );
wp_deregister_style( 'original-register-stylesheet-handle' );

wp_register_style( 'new-style', plugins_url('stylesheet.css', __FILE__) );  
wp_enqueue_style( 'new-style' );

    }

}