Yes, the hub is identical
Same 5x110 PCD and same 65.1 mm centre bore: wheels from Lotus Exige S3 front bolt on and centre on Opel Speedster 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 Lotus Exige S3 front is compared with the one from Opel Speedster 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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≈6.5Jx17 ET26 · 205/45R17 — Check on the car
Compared with the original ≈5.5Jx17 ET26 on Opel Speedster: shock absorber side +12.7 mm, wheel arch side +12.7 mm, tyre diameter −1.3 %.
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 Speedster (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 Speedster on Lotus Exige S3 front?