HOW IT WORKS
As you can see from the screenshots above, all you need is just put in a query like 'Pixel 2 vs Pixel 2XL,' and Google will display a quick comparison chart. This chart can be expanded by clicking the the blue button. There's also an option to highlight differences.
As of the time of this publication, the two google smartphones - Pixel 2 and Pixel 2XL are the only devices which appears like this in search. But it's highly expected and obvious other devices will be included.
Of course, this will spur a new trend of keywords and article writing pattern for publishers as specs comparison posts will be served in such queries hence generating traffic.
Kindly Note that This feature is yet to be officially made public by Google.
