Yes, the hub is identical
Same 5x108 PCD and same 60.1 mm centre bore: wheels from Renault Espace 3 bolt on and centre on Renault Megane 2 RS 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 Renault Espace 3 is compared with the one from Renault Megane 2 RS 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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≈7Jx17 ET50 · 225/55R17 — Check on the car
Compared with the original 7Jx17 ET68 on Renault Megane 2 RS: shock absorber side −18 mm, wheel arch side +18 mm, tyre diameter +7.1 % : fit it with the original tyre size of Renault Megane 2 RS (225/45R17), not that of Renault Espace 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 Renault Megane 2 RS (M14x1.5), 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 Renault Megane 2 RS on Renault Espace 3?