Yes, the hub is identical
Same 5x112 PCD and same 66.5 mm centre bore: wheels from Audi RS6 C8 bolt on and centre on Audi Q8 e-tron 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 RS6 C8 is compared with the one from Audi Q8 e-tron 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.
- ✓
≈7.5Jx21 ET19 · 245/40R21 — Fits like the original
Compared with the original 9.5Jx21 ET36 on Audi Q8 e-tron: shock absorber side −42.4 mm, wheel arch side −8.4 mm, tyre diameter −5.5 % : fit it with the original tyre size of Audi Q8 e-tron (265/45R21), not that of Audi RS6 C8.
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 Audi Q8 e-tron (M14x1.5), 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 Audi Q8 e-tron on Audi RS6 C8?