Yes, the hub is identical
Same 4x100 PCD and same 54.1 mm centre bore: wheels from Suzuki Splash bolt on and centre on Suzuki Alivio 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 Suzuki Splash is compared with the one from Suzuki Alivio 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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5.5Jx15 ET50 · 185/60R15 — Check on the car
Compared with the original 5.5Jx15 ET45 on Suzuki Alivio: shock absorber side +5 mm, wheel arch side −5 mm, tyre diameter −3 % : fit it with the original tyre size of Suzuki Alivio (185/65R15), not that of Suzuki Splash.
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 Suzuki Alivio (Ecrous - 12x1.25), 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 Suzuki Alivio on Suzuki Splash?