Yes, the hub is identical
Same 5x114.3 PCD and same 56.1 mm centre bore: wheels from Subaru Legacy bolt on and centre on Honda Stream 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 Honda Stream 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 Honda Stream: 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
Honda Stream has no 16-inch original wheel in our data: check the approved fitments and caliper clearance.
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≈7Jx17 ET55 · 225/55R17
Honda Stream 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 Honda Stream (Ecrous - 12x1.50), 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 Honda Stream on Subaru Legacy?