Yes, the hub is identical
Same 5x112 PCD and same 66.5 mm centre bore: wheels from Audi RS7 Sportback bolt on and centre on BMW i8 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 Audi RS7 Sportback is compared with the one from BMW i8 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 ET35 · 275/35R20 — Risk of rubbing
Compared with the original 7Jx20 ET36 on BMW i8: shock absorber side +24.4 mm, wheel arch side +26.4 mm, tyre diameter −0.4 %.
Check in detail
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≈7.5Jx21 ET19 · 245/40R21
BMW i8 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 BMW i8 (M14x1.25), 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 BMW i8 on Audi RS7 Sportback?