Yes, the hub is identical
Same 5x120 PCD and same 72.6 mm centre bore: wheels from Bentley Azure bolt on and centre on Alpina B3 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 Bentley Azure is compared with the one from Alpina B3 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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≈8Jx19 ET47 · 255/45R19 — Check on the car
Compared with the original ≈8Jx19 ET36 on Alpina B3: shock absorber side +11 mm, wheel arch side −11 mm, tyre diameter +7.7 % : fit it with the original tyre size of Alpina B3 (255/35R19), not that of Bentley Azure.
Comparison for guidance only (estimated width). Check in detail
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≈8Jx17 ET55 · 255/55R17
Alpina B3 has no 17-inch original wheel in our data: check the approved fitments and caliper clearance.
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 Alpina B3 (M12x1.50), 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 Alpina B3 on Bentley Azure?