Two different google tag manager accounts in same domain

Question

I have two google tag manager accounts one mine and another of third party website and I need to put these 2 in this third party website. I tried put two gtm scripts after body

Answer 1

Seems possible to find any answer you like for this. According to tag manager developer guide you can add multiple containers but you should use the same datalayer.

https://developers.google.com/tag-manager/devguide#multiple-containers