Yes, the hub is identical
Same 5x130 PCD and same 71.6 mm centre bore: wheels from Porsche 918 Spyder bolt on and centre on Bugatti Mistral 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 Porsche 918 Spyder is compared with the one from Bugatti Mistral 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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9.5Jx20 ET50 · 265/35R20 — Check on the car
Compared with the original ≈9Jx20 ET55 on Bugatti Mistral: shock absorber side +1.3 mm, wheel arch side +11.4 mm, tyre diameter +2.1 % : fit it with the original tyre size of Bugatti Mistral (285/30R20), not that of Porsche 918 Spyder.
Comparison for guidance only (estimated width). Check in detail
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12.5Jx21 ET48 · 325/30R21
Bugatti Mistral has no 21-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 Bugatti Mistral (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 Bugatti Mistral on Porsche 918 Spyder?