Yes, the hub is identical
Same 5x108 PCD and same 63.4 mm centre bore: wheels from Volvo V60 II bolt on and centre on Volvo EX30 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 Volvo V60 II is compared with the one from Volvo EX30 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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8Jx18 ET42 · 235/45R18 — Check on the car
Compared with the original 7.5Jx18 ET46 on Volvo EX30: shock absorber side +2.3 mm, wheel arch side +10.4 mm, tyre diameter −5.1 % : fit it with the original tyre size of Volvo EX30 (225/55R18), not that of Volvo V60 II.
Check in detail
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7Jx17 ET40.5 · 225/50R17
Volvo EX30 has no 17-inch original wheel in our data: check the approved fitments and caliper clearance.
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8Jx19 ET42 · 235/40R19
Volvo EX30 has no 19-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 Volvo EX30 (-), 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 Volvo EX30 on Volvo V60 II?