It wouldn't be hard to believe that multiple games could exist in the same universe. Plants Vs Zombies and Dragon Age: Inquisition are not the most likely of candidates however.
Dragon Age: Inquisition is filled with written stories about the game's world, Thedas. They mostly help to flesh it out and add some relevance to minor events.
This one has got to be among the most bizarre/ lovely ones though. It's the 'Plants Vs. Corpses' story!
As you can see in the image above, the story is very reminiscent of the general plot of the Plants Vs. Zombies games.