Yes, the hub is identical
Same 4x108 PCD and same 63.4 mm centre bore: wheels from Ford EcoSport bolt on and centre on Ford B Max 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 Ford EcoSport is compared with the one from Ford B Max 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 ET37.5 · 195/65R15 — Fits like the original
Compared with the original 6Jx15 ET37.5 on Ford B Max: shock absorber side 0 mm, wheel arch side 0 mm, tyre diameter +3.2 % : fit it with the original tyre size of Ford B Max (195/60R15), not that of Ford EcoSport.
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 Ford B Max (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 Ford B Max on Ford EcoSport?