the feature is not yet visible to all devices, but it is available to some selected few. Perhaps the update is is in testing mode, this explains why Google Pixel was used as a test subject.
A new feature coming to Google search will show a comparison when you search
for two phones and it detects “vs” in the search query.
A few users have reported that when they searched for two devices with “vs”
in the query, they got presented with a comparison table highlighting the specs
of both phones. The example shown below is that of the Pixel 2 and the Pixel 2
You can expand the chart by hitting the blue button, and there’s even an
option to highlight differences.
Though at the moment, this only work for two devices Pixel 2 and Pixel 2 XL
and google is yet to make any public announcement as regards this but it is a
Once the feature is active for all, you should be able to compare Samsung
Galaxy S9 and iPhone X and you will see the basic differences.
Ref: Android police