Display spheres on the UI and use different materials for them

I got little Material creator in my project, and i have a camera that captures a sphere object and renders it onto Custom Render Texture (CRT) so that the sphere can be displayed in UI using the Raw Image component. In Material creator, changes are applied to sphere’s local Material and it works just fine. But now i stumbled across a problem. I need to create a list of existing Materials, thus changing rendered sphere’s Material doesn’t work anymore since i need to display spheres with different Materials at once. So my question is how to display a CRT rendered sphere with different materials for every Raw Image, if possible?