You can't swap back and forth if its anything like the 350Z. I had one of the prototype technosquare flashes in my G35 and also one in my Z. The ECU has a security code that is keyed to the car and the key, kind of an anti theft thing, and that has to be reset by a programmer on the new ECU before it can go in.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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