Yes, the hub is identical
Same 5x130 PCD and same 71.6 mm centre bore: wheels from Bugatti Chiron bolt on and centre on Bentley Continental Flying Spur 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 Bugatti Chiron is compared with the one from Bentley Continental Flying Spur 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 ET55 · 285/30R20 — Check on the car
Compared with the original ≈8.5Jx20 ET61 on Bentley Continental Flying Spur: shock absorber side 0 mm, wheel arch side +12.4 mm, tyre diameter −9 % : fit it with the original tyre size of Bentley Continental Flying Spur (265/45R20), not that of Bugatti Chiron.
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 Bentley Continental Flying Spur (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 Bentley Continental Flying Spur on Bugatti Chiron?