Yes, the hub is identical
Same 4x114.3 PCD and same 67.1 mm centre bore: wheels from Hyundai Matrix bolt on and centre on Smart Forfour 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 Matrix is compared with the one from Smart Forfour 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.
- !
≈6Jx14 ET46 · 185/65R14 — Check on the car
Compared with the original ≈5.5Jx14 ET46 on Smart Forfour: shock absorber side +6.3 mm, wheel arch side +6.3 mm, tyre diameter +2.2 % : fit it with the original tyre size of Smart Forfour (175/65R14), not that of Hyundai Matrix.
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 Smart Forfour (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 Smart Forfour on Hyundai Matrix?