Yep
There's taking the basic idea, or a certain gameplay aspect, but that's not enough "theft" for Zynga.
EA filed a lawsuit against them for stealing concepts and ideas from The Sim's Social for The Ville, pointing out that their character skin tones had the exact same RGB coordinates, which could only really have happened via direct copy.
More stuff here: www.joystiq.com/2012/08/03/highlights-from-eas-lawsuit-against-zynga/
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