The 2 knock sensors are wired in parallel to pin d22. So the knock module might be a different part number. Someone can check the p/n to verify. I also traced an unused pin d13 that goes to knock...

There are some extra chips added. One for the rear 02s, which are not used in the code anyway, and some obd2 vpw chip that can communicate over obd2 device.
Both of this are not needed for engine...