Yes, the hub is identical
Same 5x120 PCD and same 60.1 mm centre bore: wheels from Toyota Century bolt on and centre on Lexus LS600 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 Toyota Century is compared with the one from Lexus LS600 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 ET32 · 225/55R18 — Fits like the original
Compared with the original ≈7.5Jx18 ET35 on Lexus LS600: shock absorber side −3 mm, wheel arch side +3 mm, tyre diameter +1.8 %.
Comparison for guidance only (estimated width). Check in detail
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≈7Jx20 ET40 · 225/50R20
Lexus LS600 has no 20-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 Lexus LS600 (Ecrous - 14x1.50), 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 Lexus LS600 on Toyota Century?