Yes, the hub is identical
Same 6x139.7 PCD and same 78.1 mm centre bore: wheels from Cadillac Escalade bolt on and centre on Nissan Titan 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 Cadillac Escalade is compared with the one from Nissan Titan 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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≈8.5Jx18 ET28 · 265/65R18 — Check on the car
Compared with the original 8Jx18 ET25 on Nissan Titan: shock absorber side +9.3 mm, wheel arch side +3.3 mm, tyre diameter −3.2 % : fit it with the original tyre size of Nissan Titan (265/70R18), not that of Cadillac Escalade.
Comparison for guidance only (estimated width). Check in detail
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≈8.5Jx20 ET27 · 275/55R20
Nissan Titan 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 Nissan Titan (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 Nissan Titan on Cadillac Escalade?