No difference between the OTS tunes. 2019 and up is different, but 2015 - 2018 are compatible.
https://eqtuning.com/apps/help-center#used
Question: I am thinking about buying a used Accessport that has EQT tunes on them, will they work for my car?
Answer: "it depends". Depending on the version tune, the tune that someone else has on their Accessport may or may not work on your vehicle. For 2015-2018 vehicles, All modern tunes starting with v2.0 are built upon the Cobb Consolidated ROM file structure (CCF for short) and they are interchangeable between any 2015-2018 of that particular model vehicle. So for example a tune for a GTI or A3 for a 2015 can work on another 2015-2018 GTI or A3. And the same for the Golf R and S3.
2019+ is a whole different ECU and cannot interchange with the older ones. So no a 2019 tune will not be compatible with a 2015-2018.