What's the difference between those two part numbers? I'm looking in to doing this upgrade as well. Also, the 7 in screen and head unit are the best upgrade that can be made on the 2017 correct? The 8.4 in isn't compatible? Thanks.The screen part number is P68316174AB . This is the same part number for 2018 and 2019 models.
The processing unit numbers that seem to work are
2. 68308807AE - This is what I am using and carplay works fine.