Use another author.php if different multisite subsite?

This was the solution..

// different author template */
add_filter( 'template_include', 'author_template', 99 );

function author_template( $template ) {
    if( !is_main_site() and is_author( ) ) {
        $new_template = locate_template( array( 'other-author.php' ) );
        if ( '' != $new_template ) {
            return $new_template ;
        }
    }
    return $template;
}