Yes, the hub is identical
Same 5x108 PCD and same 65.1 mm centre bore: wheels from Volvo S70 bolt on and centre on Volvo 164 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 S70 is compared with the one from Volvo 164 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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≈6Jx15 ET43 · 185/65R15 — Check on the car
Compared with the original ≈6Jx15 ET25 on Volvo 164: shock absorber side +18 mm, wheel arch side −18 mm, tyre diameter −5 % : fit it with the original tyre size of Volvo 164 (195/70R15), not that of Volvo S70.
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 Volvo 164 (Ecrous - 1/2 - 20 UN), 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 164 on Volvo S70?