Yes, the hub is identical
Same 5x115 PCD and same 70.3 mm centre bore: wheels from Pontiac Bonneville bolt on and centre on Chevrolet Alero 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 Bonneville is compared with the one from Chevrolet Alero 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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≈7Jx15 ET43 · 215/65R15 — Fits like the original
Compared with the original ≈7Jx15 ET43 on Chevrolet Alero: shock absorber side 0 mm, wheel arch side 0 mm, tyre diameter +3.4 % : fit it with the original tyre size of Chevrolet Alero (215/60R15), not that of Pontiac Bonneville.
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 Chevrolet Alero (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 Chevrolet Alero on Pontiac Bonneville?