How do I zoom in and out of two scenes simultaneously??

I cannot find a way to zoom in and out of two scenes simultaneously and wonder is there a way.

It happens with stereo option so there must be a way to control this...

I can make it so that if I rotate or tilt in one scene, the equivalent happens in scene2 but cannot seem to do the same for zoom.

            while 1:
                scene2.forward = scene.forward
                scene2.up = scene.up

This is what I have so far...

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