Are gtag.js and gtm.js interchangeable?

Question

Hi I'm new to Google Tag Manager,

I am trying to add Google Adwords Conversion Pixel to our website, and google tells me I should add the following snippet.

  gtag('event', 'conversion', {
      'send_to': 'AW-1000000/XXXXXXXX',
      'event_callback': callback
  });

Since our website is already using gtm.js,

can I convert the above snippet to the following to get the same effect?

dataLayer.push({ "event": "conversion", 
"send_to": "AW-1000000/XXXXXXXX", "event_callback": undefined})

Answer 1

No. But you can create an Adwords conversion tag within GTM (there is a template for this, the part before the slash is the conversion id, the part after the slash the conversion label). If you want you can configure the tag via the dataLayer, but you'd still have to create a tag within GTM and apply a trigger to make this work.