Yes, the hub is identical
Same 5x100 PCD and same 56.1 mm centre bore: wheels from Subaru Legacy bolt on and centre on Rover 75 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 Subaru Legacy is compared with the one from Rover 75 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 ET55 · 195/65R15 — Check on the car
Compared with the original ≈6Jx15 ET50 on Rover 75: shock absorber side +5 mm, wheel arch side −5 mm, tyre diameter +0 %.
Comparison for guidance only (estimated width). Check in detail
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≈6.5Jx16 ET55 · 205/60R16
Rover 75 has no 16-inch original wheel in our data: check the approved fitments and caliper clearance.
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≈7Jx17 ET55 · 225/55R17
Rover 75 has no 17-inch original wheel in our data: check the approved fitments and caliper clearance.
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 Rover 75 (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 Rover 75 on Subaru Legacy?