I was wondering if I can flash my other oneplus' TWRP backup on this so i dont have to configure all over again.
I would say no. I just remember some people doing this would and it replaced IMEI information from previous phone and could potentially screw up your new phone. What is so important that you need to restore for TWRP anyways. A fresh flash on a new phone is the best route to take my friend
We make too much of simply taken the time to restore and reset things on a new flash.
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