I guess I confused. How can it be another immo generation if both ECUs are Simos 18.1, HW ID 06K 907 425 B ? Thank you.
Because hardware has nothing to do with what software it's running.
If it's a Polo GTI you have a whole different CAN matrix. Most likely immo comms are different too.
A few hints, and sent messages.
Message formats are different too.