Yes, the hub is identical
Same 5x114.3 PCD and same 66.1 mm centre bore: wheels from Infiniti QX60 bolt on and centre on Infiniti G37 Coupe 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 Infiniti QX60 is compared with the one from Infiniti G37 Coupe 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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≈8Jx18 ET50 · 255/60R18 — Check on the car
Compared with the original ≈7Jx18 ET24 on Infiniti G37 Coupe: shock absorber side +38.7 mm, wheel arch side −13.3 mm, tyre diameter +11.9 % : fit it with the original tyre size of Infiniti G37 Coupe (225/50R18), not that of Infiniti QX60.
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 Infiniti G37 Coupe (Ecrous - 12x1.25), 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 Infiniti G37 Coupe on Infiniti QX60?