I didn't mess with the philips screw on the amp previously because I saw another thread where some were suggesting it was a crossover and to leave it alone. But, after playing with it, I feel pretty certain it is a simple gain knob.
After my previous post I saw this post from a person who felt the 97 setting was for a system with reduced output to the amp:
Link
But which vehicle would that be?!?
So I used a long ethernet cable which would reach from my trunk to the front seat and listened to various segments of different songs using the sub gain at 50%. Ultimately, I still felt that the output of 97 might be slightly reduced compared to 57, but it was so minor that it could have simply been placebo. It's very hard to listen to an audio segment twice and not discover some new nuance to how it sounds.
I'm not sure whether the version 2.0 listed in the table refers to the file or the something regarding the vehicle. I also noticed the names of the files on the SD Card:
Golf 7 EU 4dr_v1.s57
Golf 7 EU 4dr mit Netzteilregelung.s97
"Golf 7 EU 4dr mit Netzteilregelung" translates to "Golf 7 EU 4dr with power supply control".
The date on the 97 file is 8/29/2016 - maybe that lines up with the B revision and/or the mk7.5 release?
I did compare the files and see that the hex codes within are completely different - so at least it doesn't seem to be a straight copy and pasted file.
At this point I don't feel any closer to understanding why there are two options