Yes, the hub is identical
Same 4x100 PCD and same 56.1 mm centre bore: wheels from Nissan Dayz bolt on and centre on Rover 200-Serie 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 Nissan Dayz is compared with the one from Rover 200-Serie 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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4.5Jx14 ET46 · 155/65R14 — Fits like the original
Compared with the original ≈5.5Jx14 ET45 on Rover 200-Serie: shock absorber side −11.7 mm, wheel arch side −13.7 mm, tyre diameter −4.5 % : fit it with the original tyre size of Rover 200-Serie (175/65R14), not that of Nissan Dayz.
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 Rover 200-Serie (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 Rover 200-Serie on Nissan Dayz?