How Throttle body should match with car? Diff #?

[Amir]

Hello
I bought the old Volvo S80 t6 2001 (B6284T) twin turbo.
It wouldn’t turn on engine mechanics diagnost
1: ECM 903C THROTTLE POSITION SENSOR
2: ECM 982A
I bought second hand ECM PART exactly same as original. But The serial numbers and oe# of car throttle body is 36050563 - 8644346- 65CFM2 - white label- Magneti Marelli.
Question:
1: this throttle body is original? Is it fit with twin turbo?
2: if I buy diff # like 8644347 with yellow label it will fit to my car?
3: what is original part number and oe#?
Appreciate you .