Do Chromebooks All Have Different Gestures?

I noticed in the HP Chromebook 14 review it said Chrome OS had no easy way to view and switch windows.

But on my Chromebook, 3 fingers swipe up brings up the window switcher with all open windows. Does that not work on the C14? And 4 finger pinch on the touch screen minimizes the current window and leaves open the previous window. I'm not sure if this works on the Acer 720P.

Do different Chromebooks have different gestures available? If so, why?