Yes, the hub is identical
Same 4x100 PCD and same 54.1 mm centre bore: wheels from Hyundai i20 III bolt on and centre on Aston Martin Cygnet 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 Hyundai i20 III is compared with the one from Aston Martin Cygnet 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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6Jx16 ET50 · 195/55R16 — Check on the car
Compared with the original ≈5.5Jx16 ET45 on Aston Martin Cygnet: shock absorber side +11.4 mm, wheel arch side +1.3 mm, tyre diameter +0.7 %.
Comparison for guidance only (estimated width). Check in detail
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6Jx15 ET47 · 185/65R15
Aston Martin Cygnet has no 15-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 Aston Martin Cygnet (Ecrous - 12x1.50), 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 Aston Martin Cygnet on Hyundai i20 III?