Yes, the hub is identical
Same 5x112 PCD and same 66.6 mm centre bore: wheels from MG RX5 bolt on and centre on MG S5 EV 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 MG RX5 is compared with the one from MG S5 EV 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 ET41 · 215/60R17 — Check on the car
Compared with the original 7Jx17 ET51 on MG S5 EV: shock absorber side −10 mm, wheel arch side +10 mm, tyre diameter +0 %.
Comparison for guidance only (estimated width). Check in detail
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≈7Jx18 ET41 · 225/50R18 — Check on the car
Compared with the original 7Jx18 ET51 on MG S5 EV: shock absorber side −10 mm, wheel arch side +10 mm, tyre diameter −3.2 % : fit it with the original tyre size of MG S5 EV (225/55R18), not that of MG RX5.
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 MG S5 EV (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 MG S5 EV on MG RX5?