The Fiesta wheels should fit, though it's best to ask your dealership about it. The PCD for both the EcoSport and Fiesta is 4x108.
Very true. I noticed that these days there's a rise in aftermarket wheel companies that have more OEM looking wheels, but more of what you'd find in the higher trims.If they don't have to be Ford factory wheels, there's always the aftermarket tire and wheel stores for a lot more options.