That's great! a good test to swap the EV-ECU and get to READY, so the old ECU has a defect in the drive for the Main Contactors.
We don't have a schematic for the ECU in order to troubleshoot for a defective component.
I took it apart to visually inspect it, but it looks brand new, without any signs of failure.
I ordered a new one from Poland. I hope it will work, fingers crossed.
I measured the capacitors, they are charged now.
There is a difference between the two ECUs, I even tested the bad one in the good car, but it showed me no charge in the battery.
The battery pack of the new car is different, it has less packs. So I was surprised the older one is functioning with it.
I will keep you posted.