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I wouldn't say so... The gameplay is present in both, although it's radically different.
In *Shadowverse*, the plot is more like "Well, it feels a bit awkward to have a card game without a plot, so let's come up with some random story on the fly," while in *Gwent*, it's the foundation of the overall experience. This doesn't automatically make it good, but at least it prevents the game from completely falling apart (and some of the storylines actually turn out to be quite good).