Yes, the hub is identical
Same 5x100 PCD and same 56.1 mm centre bore: wheels from Subaru Impreza WRX STi bolt on and centre on Toyota GT 86 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 Impreza WRX STi is compared with the one from Toyota GT 86 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 ET53 · 225/45R17 — Check on the car
Compared with the original 7Jx17 ET48 on Toyota GT 86: shock absorber side +5 mm, wheel arch side −5 mm, tyre diameter +1.4 %.
Comparison for guidance only (estimated width). Check in detail
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≈7Jx17 ET55 · 225/50R17 — Check on the car
Compared with the original 7Jx17 ET48 on Toyota GT 86: shock absorber side +7 mm, wheel arch side −7 mm, tyre diameter +5 % : fit it with the original tyre size of Toyota GT 86 (215/45R17), not that of Subaru Impreza WRX STi.
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 Toyota GT 86 (Ecrous - 12x1.25), 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 Toyota GT 86 on Subaru Impreza WRX STi?