Different right sidebar for pages.

sidebar.php

<?php
/**
 * The Sidebar containing the main widget areas.
 *
 * @package GeneratePress
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

// If the navigation is set in the sidebar, set variable to true.
$navigation_active = ( 'nav-right-sidebar' == generate_get_navigation_location() ) ? true : false;

// If the secondary navigation is set in the sidebar, set variable to true.
if ( function_exists( 'generate_secondary_nav_get_defaults' ) ) {
	$secondary_nav = wp_parse_args(
		get_option( 'generate_secondary_nav_settings', array() ),
		generate_secondary_nav_get_defaults()
	);

	if ( 'secondary-nav-right-sidebar' == $secondary_nav['secondary_nav_position_setting'] ) {
		$navigation_active = true;
	}
}
?>
<div id="right-sidebar" itemtype="http://schema.org/WPSideBar" itemscope="itemscope" role="complementary" <?php generate_right_sidebar_class(); ?>>
	<div class="inside-right-sidebar">
		<?php
		/**
		 * generate_before_right_sidebar_content hook.
		 *
		 * @since 0.1
		 */
		do_action( 'generate_before_right_sidebar_content' );
		
		if ( is_singular( 'page' ) ) {
			
			dynamic_sidebar( 'page_sidebar' );
			
		} else {

			if ( ! dynamic_sidebar( 'sidebar-1' ) ) :

				if ( false == $navigation_active ) : ?>

					<aside id="search" class="widget widget_search">
						<?php get_search_form(); ?>
					</aside>

					<aside id="archives" class="widget">
						<h2 class="widget-title"><?php esc_html_e( 'Archives', 'generatepress' ); ?></h2>
						<ul>
							<?php wp_get_archives( array( 'type' => 'monthly' ) ); ?>
						</ul>
					</aside>

				<?php endif;

			endif;
		}

		/**
		 * generate_after_right_sidebar_content hook.
		 *
		 * @since 0.1
		 */
		do_action( 'generate_after_right_sidebar_content' );
		?>
	</div><!-- .inside-right-sidebar -->
</div><!-- #secondary -->