How can I make a sky box out of 6 images, when I have a sphere and not a box?

I have 6 images I used in Unity to make a nice sky and now I want to use the same sky in the project I’m working on in Unreal Engine. How can I do that when the skybox is actually a sphere working in a completely different way?

Is there a way to make the sky out of a box, or is there a way to wrap these images in a sphere?