Replacement of Volvo B5244S2 engine control unit with B5244S control unit

Hello together, I would like to give my Volvo V70 1 more power. Had then informed me about chip tuning… but they cost clearly (unfortunately). Since I found out that the B5244S2 with 140hp engine is a throttled version of the B5244S with 170hp, I would also like to exploit this power potential (with BSR tuning you get with chip tuning to approx. 188hp). Because a chip tuning e.g. with BSR tuning costs more than 200€ if possible I would install a control unit from the B5244S to reach the 170hp….. (a control unit for the B5244S engine costs approx.70€-90€) I have a couple of questions about this conversion (if necessary there are experiences from others) 1. Can I replace the control unit so easily? (like for example plug and play so ) 2. What about the immobilizer? (is the e.g. stored in the engine control unit or is the separate? ) 3. Do I have to pay attention to something else? I would like to thank you for your ideas/helps/experiences Greeting RacingHamster