here is my real-life example, both blazer and shoe are green
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To be honest, I don't like that shade of green. It's a nice color -- for furniture, walls, cars, maybe a casual shirt. For a jacket or shoes? I don't like it. I certainly don't think they should be worn together. Wearing two items in an unusual color strikes me as cutesy.
I've worn brown jackets with shoes in a similar shade of brown, and it hasn't bothered me, but people in the WAYWRN thread have dinged me for it. Brown's a pretty normal color for shoes and jackets, though.