Hi thanks for your answer,
in the meantime I opened both and they have exactly the same layout, the only differences are the solenoid and harness, I will switch it from 98 to 97.
I see I have to switch the D shaped connector also but it looks not to be very complicated, I think they are just pushed in from inside.
I saw they was a second upgrade in 98: from late 97 they replaced the roller clutch by a mechanical diod, is it required to replace it ?
If yes is , is it complicated? I have no idea about the procedur, I even don't know where this part is located, and I don't feel it so much, I would like to keep the old system, the second reason is the price of the mechanical diode kit.....over 200