Can s90 seats be fitted to S60

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While I'm waiting for that mountain of spare parts that still need to be installed on my new seats (to make everything simple), I found another question. And these are the rear headrests. Now in my car the rear headrests fold with a physical button on the back of the seat. But in the new seat the headrests are already electric (the ones that fold with a button in the system menu). Perhaps this has already been discussed on the forum, if so, please give a link. Or how to solve this issue to integrate a new seat with an electric headrest?