Yes, the hub is identical
Same 5x108 PCD and same 63.4 mm centre bore: wheels from Polestar Polestar 3 axe arrière bolt on and centre on Volvo S60 III without rings. You still need to check the offset and tyres, detailed below.
≈: width estimated from the original tyre size.
Wheel by wheel: offset and tyres
Each original wheel from Polestar Polestar 3 axe arrière is compared with the one from Volvo S60 III of the same diameter: how much closer the wheel gets to the shock absorber or how far it sticks out of the wheel arch, and whether the tyre keeps the same overall diameter.
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≈9Jx20 ET30 · 285/45R20 — Check on the car
Compared with the original 8Jx20 ET45.5 on Volvo S60 III: shock absorber side −2.8 mm, wheel arch side +28.2 mm, tyre diameter +12.5 % : fit it with the original tyre size of Volvo S60 III (245/35R20), not that of Polestar Polestar 3 axe arrière.
Comparison for guidance only (estimated width). Check in detail
Before fitting the wheels
An identical hub is not enough: offset, width and diameter change the position of the wheel, and larger calipers can touch a smaller wheel. Original wheels often use bolts or nuts with a specific seat: keep the fixings intended for the wheel, with the thread of Volvo S60 III (M14x1.5), tightened to the torque shown on its vehicle page. Finally, check that the size is among the approved fitments for your vehicle. This comparison is for guidance only: have the fitting approved by a professional.
And the other way round: wheels from Volvo S60 III on Polestar Polestar 3 axe arrière?