Yes, the hub is identical
Same 4x108 PCD and same 65.1 mm centre bore: wheels from Saab 9000 bolt on and centre on Citroen C3 Aircross 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 Saab 9000 is compared with the one from Citroen C3 Aircross 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.
- !
≈6Jx15 ET33 · 185/65R15 — Check on the car
Compared with the original ≈6Jx15 ET23 on Citroen C3 Aircross: shock absorber side +10 mm, wheel arch side −10 mm, tyre diameter −2 % : fit it with the original tyre size of Citroen C3 Aircross (195/65R15), not that of Saab 9000.
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 Citroen C3 Aircross (M12x1.25), 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 Citroen C3 Aircross on Saab 9000?