my wife has the 2017 pro with the second gen. i have a 2016 macbook with the first gen.
there is a noticeable difference in travel, but you forget about it after a while and just type. No difference in accuracy for me, and if i wasnt told they were of different generation id chalk up the difference to the manufacturer's tolerance.
the difference isnt as life changing as id thought.
Now my buddy bought a 2018 macbook air, and i absolutely cannot tell the difference in feel, but I can tell because of the sound, which I prefer..
YMMV.