Yes, the hub is identical
Same 5x114.3 PCD and same 67.1 mm centre bore: wheels from Mazda CX-80 bolt on and centre on Mazda Mazda3 BP 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 Mazda CX-80 is compared with the one from Mazda Mazda3 BP 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 · 235/60R18 — Check on the car
Compared with the original 7Jx18 ET45 on Mazda Mazda3 BP: shock absorber side +6.4 mm, wheel arch side +6.4 mm, tyre diameter +13.6 % : fit it with the original tyre size of Mazda Mazda3 BP (215/45R18), not that of Mazda CX-80.
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 Mazda Mazda3 BP (M12x1.5), 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 Mazda Mazda3 BP on Mazda CX-80?