@Sam1970 

Hi, welcome to the community.

When you asked whether they are compatible with other, would there be any specific details you want to know?

Here is some information for your reference:

1. They would need to be controlled by different Apps. Deco M4 will be used Deco APP while HX220 needs Aginet APP.

2. Deco Mesh is a seperate Mesh system from EasyMesh.---Can Deco Mesh, OneMesh, EasyMesh and Omada Mesh products work together?

3. The first main Deco M4 still needs to be connected to HX220 via an Ethernet cable.

4. Both HX220 and EX230V are AX1800, I think you might need more a more advanced model, like AX300 and ablove( for example Deco X50/60/68) to make full use of 900m/s.

https://www.tp-link.com/en/home-networking/deco/?filterby=5825

Thank you very much and best regards.