Check $post->ID against multiple values

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This is more of a PHP question than specifically WordPress, but you can use PHP’s in_array to test if $post->ID is in a bunch of values, like this:

    <?php if( in_array($post->ID, [13052, 1234, 4242]) ) { ?>
    <!-- Event snippet for thank-you page --><script>  gtag('event', 'conversion', {'send_to': 'AW-105871269/5v9gsts6dbdsJ-Kl'});</script>
    <?php } ?>