Yes, the hub is identical
Same 5x114.3 PCD and same 67.1 mm centre bore: wheels from Mazda Mazda3 MPS bolt on and centre on Kia EV3 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 Mazda Mazda3 MPS is compared with the one from Kia EV3 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.
- ✓
≈7Jx17 ET50 · 225/45R17 — Fits like the original
Compared with the original 7Jx17 ET48 on Kia EV3: shock absorber side +2 mm, wheel arch side −2 mm, tyre diameter −8 % : fit it with the original tyre size of Kia EV3 (215/60R17), not that of Mazda Mazda3 MPS.
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 Kia EV3 (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 Kia EV3 on Mazda Mazda3 MPS?