Enqueue Scripts/Styles on the post-new.php and post.php pages in admin #SpecificPage

functions.php

add_action( 'admin_print_scripts-post-new.php', 'your_prefix_enqueue_scripts' );
add_action( 'admin_print_scripts-post.php',     'your_prefix_enqueue_scripts' );

// OR

function enqueue_my_scripts() {
	global $pagenow;
	if ( ! empty( $pagenow ) && ( 'post-new.php' === $pagenow || 'post.php' === $pagenow ) ) {
		wp_enqueue_script();
	}
}
add_action( 'admin_enqueue_scripts', 'enqueue_my_scripts' );