add_filter( 'elementor/widget/render_content', function ( $widget_content, $widget ) {

    if ( 'accordion' === $widget->get_name() ) {

        $widget_content = preg_replace(

            '/<a[^>]*class="elementor-accordion-title"[^>]*>(.*?)<\/a>/',

            '<span class="elementor-accordion-title">$1</span>',

            $widget_content

        );

    }

    if ( 'toggle' === $widget->get_name() ) {

        $widget_content = preg_replace(

            '/<a[^>]*class="elementor-toggle-title"[^>]*>(.*?)<\/a>/',

            '<span class="elementor-toggle-title">$1</span>',

            $widget_content

        );

    }

    return $widget_content;

}, 10, 2 );