Yes, with hub centric rings
Same 6x120 PCD, but the centre bore of the wheels from GMC Acadia (74.5 mm) is larger than the hub of Cadillac XT5 (66.9 mm): you need 4 hub centric rings 74.5 → 66.9.
Rings 74.5 → 66.9
≈: width estimated from the original tyre size.
Wheel by wheel: offset and tyres
Each original wheel from GMC Acadia is compared with the one from Cadillac XT5 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 · 255/65R18 — Check on the car
Compared with the original ≈7.5Jx18 ET50 on Cadillac XT5: shock absorber side +6.3 mm, wheel arch side +6.3 mm, tyre diameter +3.4 % : fit it with the original tyre size of Cadillac XT5 (235/65R18), not that of GMC Acadia.
Comparison for guidance only (estimated width). Check in detail
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≈7.5Jx17 ET50 · 245/65R17
Cadillac XT5 has no 17-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 Cadillac XT5 (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 Cadillac XT5 on GMC Acadia?