Try something like this:
$pages = get_posts();
$page_ids_to_swap_the_template = array( 1, 2, 3, etc... );
foreach ( $pages as $page ) {
if ( in_array( $page->ID, $page_ids_to_swap_the_template ) ) {
update_post_meta( $page->ID, '_wp_page_template', 'new_template.php' );
}
}
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