Yes, the hub is identical
Same 5x110 PCD and same 65.1 mm centre bore: wheels from Pontiac Solstice bolt on and centre on Alfa Romeo Tonale 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 Pontiac Solstice is compared with the one from Alfa Romeo Tonale 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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≈7.5Jx18 ET45 · 245/45R18 — Check on the car
Compared with the original ≈7Jx18 ET37 on Alfa Romeo Tonale: shock absorber side +14.4 mm, wheel arch side −1.6 mm, tyre diameter −3.8 % : fit it with the original tyre size of Alfa Romeo Tonale (225/55R18), not that of Pontiac Solstice.
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 Alfa Romeo Tonale (M12x1.25), 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 Alfa Romeo Tonale on Pontiac Solstice?