Yes, the hub is identical
Same 5x100 PCD and same 57.1 mm centre bore: wheels from Skoda Fabia IV bolt on and centre on Audi A1 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 Skoda Fabia IV is compared with the one from Audi A1 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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5.5Jx15 ET40 · 185/65R15 — Check on the car
Compared with the original 6Jx15 ET29 on Audi A1: shock absorber side +4.7 mm, wheel arch side −17.4 mm, tyre diameter +3.1 % : fit it with the original tyre size of Audi A1 (185/60R15), not that of Skoda Fabia IV.
Check in detail
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6Jx16 ET45 · 195/55R16
Audi A1 has no 16-inch original wheel in our data: check the approved fitments and caliper clearance.
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7Jx17 ET51 · 215/45R17
Audi A1 has no 17-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 Audi A1 (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 Audi A1 on Skoda Fabia IV?