To my eye, these are just different/just similar enough to look like a mistake.

No, chrome is cool and nickel is warm, they don't go well together to my eye.

I agree with lindsey--too close for contrast. If you find polished nickel too expensive, then use all chrome. Further, nickel is a living finish, which means it will patina (another word for tarnish). Chrome will look the same in 10 years as it does when new.