Switching Google ads conversion tracking to enhanced conversions

Hi,

I’m trying to implement enhanced conversions for Google ads in our store and am a bit confused about some things.

I know that in order to avoid any disruption in campaigns that are already running on smart bidding, it’s better to modify the current conversion in Google ads, rather than create a separate one and I already know the steps required from the G ads side in order to do that as I’ve taken them from this guide: https://feedarmy.com/kb/adding-adwords-conversion-tracking-to-shopify/

However, I don’t entirely understand if I have to completely replace the new script with the old gtag script in the “additional checkout scripts” section in Shopify. Also, I have a remarketing script there. That one I have to leave I suppose?

This is the existing script I’m referring to:

{% if first_time_accessed %}

This is the remarketing script:

{% endif %}

Thanks in advance.