Yes, the hub is identical
Same 5x114.3 PCD and same 67.1 mm centre bore: wheels from Maserati Quattroporte bolt on and centre on Ferrari 296 GTB 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 Maserati Quattroporte is compared with the one from Ferrari 296 GTB 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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≈7.5Jx20 ET45 · 245/40R20 — Fits like the original
Compared with the original ≈7.5Jx20 ET44 on Ferrari 296 GTB: shock absorber side +1 mm, wheel arch side −1 mm, tyre diameter +3.6 % : fit it with the original tyre size of Ferrari 296 GTB (245/35R20), not that of Maserati Quattroporte.
Comparison for guidance only (estimated width). Check in detail
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≈6.5Jx16 ET30 · 205/55R16
Ferrari 296 GTB has no 16-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 Ferrari 296 GTB (M14x1.50), 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 Ferrari 296 GTB on Maserati Quattroporte?