Yes, the hub is identical
Same 5x114.3 PCD and same 67.1 mm centre bore: wheels from Hyundai Kona bolt on and centre on Hyundai ix35 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 Kona is compared with the one from Hyundai ix35 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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≈6.5Jx16 ET44 · 205/65R16 — Fits like the original
Compared with the original 6.5Jx16 ET45 on Hyundai ix35: shock absorber side −1 mm, wheel arch side +1 mm, tyre diameter −4.9 % : fit it with the original tyre size of Hyundai ix35 (215/70R16), not that of Hyundai Kona.
Comparison for guidance only (estimated width). Check in detail
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7.5Jx18 ET52 · 235/45R18
Hyundai ix35 has no 18-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 Hyundai ix35 (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 Hyundai ix35 on Hyundai Kona?