How to simultaneously zoom in-out inside a ui with multiple QGraphicsViews

I have been reading a lot on how to zoom in-out inside a singular QGraphicsView. I need to zoom simultaneously inside a user interface that has N.2 QGraphicsViews. This article is very useful and this article too.

What would be the easiest way to zoom in-out at the same time inside two QGraphicsView if I would like to expand this explanation already provided? Or alternatively what would be the best approach?