Yes, the hub is identical
Same 5x120 PCD and same 72.6 mm centre bore: wheels from Alpina B4 axe avant bolt on and centre on Rolls-Royce Wraith 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 Alpina B4 axe avant is compared with the one from Rolls-Royce Wraith 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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≈7.5Jx19 ET36 · 245/35R19 — Check on the car
Compared with the original ≈8Jx19 ET25 on Rolls-Royce Wraith: shock absorber side +4.7 mm, wheel arch side −17.4 mm, tyre diameter −11.3 % : fit it with the original tyre size of Rolls-Royce Wraith (255/50R19), not that of Alpina B4 axe avant.
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 Rolls-Royce Wraith (M14x1.50), 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 Rolls-Royce Wraith on Alpina B4 axe avant?