There are a few minor differences between the 2017 mk7 and the 2018 mk7.5 and up Alltrack. Some nice updates as well as areas where they cut costs.
Some things they cut from 2018 mk7.5+ are under hood insulation, under seat driver side drawer, sirius xm radio and antennae on the S model (only available on the SE and SEL I believe), cd player in the glove box on S models (now integrated behind the radio screen on mk7.5 s model).
Some things they added on the 2018 mk7.5+ are rear led tail lights, driver assist standard on all models, updated mk7.5 headlights (led drls on base headlights or led headlights on the upgraded lighting package headlights) interior dash trim is slightly darker. Also you can get a manual in the SEL as well as get the lighting package on the SE model.
I'm sure there a few more but these are the ones that I remember.
Upgrades? ALL OF THEM- huge parts list from mk7 GTI and R that works with the Alltrack. I'm APR IS20 stage 2 and really enjoy it the car and how it performs like a real sleeper wagon.