Yes, the hub is identical
Same 5x112 PCD and same 66.6 mm centre bore: wheels from Mercedes EQC bolt on and centre on Mercedes GLS-Classe 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 Mercedes EQC is compared with the one from Mercedes GLS-Classe 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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8Jx19 ET34 · 235/55R19 — Risk of rubbing
Compared with the original 8.5Jx19 ET62.5 on Mercedes GLS-Classe: shock absorber side −34.9 mm, wheel arch side +22.2 mm, tyre diameter −5.6 % : fit it with the original tyre size of Mercedes GLS-Classe (275/55R19), not that of Mercedes EQC.
Check in detail
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 Mercedes GLS-Classe (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 Mercedes GLS-Classe on Mercedes EQC?