What is the difference between 3Ps and non-duality? listener question

I wonder if you can help me... I was introduced to the 3ps a few years ago and took a deep dive into them. 

My coach has been pointing to the idea of non duality, and I can feel there is something for me to see here. 

I'm intrigued to say the least.  What do you see is the difference (if any), between the understanding of the principles and non duality and where do these understandings overlap?