Yes, the hub is identical
Same 5x114.3 PCD and same 66.1 mm centre bore: wheels from Nissan Murano bolt on and centre on Infiniti QX55 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 Nissan Murano is compared with the one from Infiniti QX55 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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≈8Jx20 ET50 · 255/55R20 — Check on the car
Compared with the original ≈7Jx20 ET44 on Infiniti QX55: shock absorber side +18.7 mm, wheel arch side +6.7 mm, tyre diameter +11 % : fit it with the original tyre size of Infiniti QX55 (225/45R20), not that of Nissan Murano.
Comparison for guidance only (estimated width). Check in detail
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7.5Jx18 ET50 · 235/65R18
Infiniti QX55 has no 18-inch original wheel in our data: check the approved fitments and caliper clearance.
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 QX55 (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 QX55 on Nissan Murano?