Please, help me. How can i do something like this?

Iam not experienced enough in UE4 and I have an idea in my head and i need to do something like this:
I want Unreal engine 4 to render 2 images at the same time on top of eachother. Then, lets just say there will be a circle with a MASK effect and inside that mask player will be able to see another screen. And those 2 screens are different. First one is cute and bright and the other one is dark and horrible.
For example: in 1 screen you are looking at flower but if you will look through the object that has mask effect, you are looking at skull or something.
If there is a way to do it otherwise-let me know