functions.php

<?php

add_action( 'genesis_before_sidebar_widget_area', __NAMESPACE__ . '\\sidebar_switcher' );
/**
 * Conditionally replace the sidebar.
 *
 * @since 1.0.0
 */
function sidebar_switcher() {

	// Switch to a different sidebar for 'project_post_type' CPT.
	if ( 'project_post_type' === get_post_type() && is_active_sidebar( 'project-post-type-sidebar' ) ) {
		remove_action( 'genesis_sidebar', 'genesis_do_sidebar' );
		add_action( 'genesis_sidebar', function(){
			dynamic_sidebar( 'project-post-type-sidebar' );
		});
	}

}