DataLayer Synchronisation & Matomo Analytics : Ecommerce

Hello, a few questions about the two tags

We are currently switching to a new shop system and I have to test everything.

I have always kept up with the Matomo updates and then last night I noticed that there are new tags.

I stick very closely to Google’s standard when it comes to GTM, especially with the data layer, so that I don’t have to do much here.

So yesterday I took the {{ecommerce}} from Google and inserted it directly into Matomo.

Unfortunately, nothing came of it.

What should the {{ecommerce}} look like for the tag, like the old one or is Matomo now more oriented towards GA4 and GTM?

Where can I find detailed documentation on the two new tags?

If I use the 2nd tag (data layer synchronization)

will the data layer be used and rewritten in a Matomo-compliant manner?

Why should you use this or where do you use it? I am currently building the data layers the same for both tag managers.

Thanks for your answers and help!