Yes, with hub centric rings
Same 5x110 PCD, but the centre bore of the wheels from Saab 900 (71.5 mm) is larger than the hub of Opel Meriva (65.1 mm): you need 4 hub centric rings 71.5 → 65.1.
Rings 71.5 → 65.1
≈: width estimated from the original tyre size.
Wheel by wheel: offset and tyres
Each original wheel from Saab 900 is compared with the one from Opel Meriva 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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≈6Jx15 ET49 · 185/65R15 — Check on the car
Compared with the original 6.5Jx15 ET35 on Opel Meriva: shock absorber side +7.6 mm, wheel arch side −20.4 mm, tyre diameter −2 % : fit it with the original tyre size of Opel Meriva (195/65R15), not that of Saab 900.
Comparison for guidance only (estimated width). 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 Opel Meriva (M12x1.50), 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 Opel Meriva on Saab 900?