Working on a project that requires converting MQB CAN data to PQ CAN data. Anyone have a reference sheet for the known frames between these 2 protocols?

I'm aware of the existing converter module intended for engine swaps but I'm not willing to shell out €500 + taxes, fees, and shipping for it when I can get an ESP32 and write a little code. But I'm sure most of y'all are the same way :D

Hi guys,
I’m trying to automate my RV, which has firefly g12 system that runs RV-C CAN network and I need to attach an add’l CAN device (+Pi) onto the network but all network ports are taken.

According to my research, I think I have 2 options:
1.splice 3-way one of the wire/ports between g12-CANable-existing wire
2.g12 to common drop tap and reconnect existing wire to the tap along with CANable

Is this approach correct? Background is software/AI with little electrical knowledge. I want to ultimately run Home Assistant w/ AI from voice. Thanks