Yes, the hub is identical
Same 5x100 PCD and same 57.1 mm centre bore: wheels from Pontiac Sunbird bolt on and centre on Volkswagen Fox 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 Sunbird is compared with the one from Volkswagen Fox 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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≈6Jx13 ET45 · 185/80R13 — Check on the car
Compared with the original ≈5Jx13 ET35 on Volkswagen Fox: shock absorber side +22.7 mm, wheel arch side +2.7 mm, tyre diameter +8.3 % : fit it with the original tyre size of Volkswagen Fox (155/80R13), not that of Pontiac Sunbird.
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 Volkswagen Fox (M12x1.50), 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 Volkswagen Fox on Pontiac Sunbird?