2D image size different on rear camera

Hi guys, I need help with what I’m hoping is a very newbie question. I have a very simple effect when I am placing a 2D image on the scene. I have set the scale and position and everything works well on the phone’s self-facing camera.

However, when I switch to the rear-facing camera, then image size changes (it usually gets larger). How can I make it so that both the self and rear-facing cameras show the same image at the same scale and position?

Voted you are welcome