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Um....
It was quite apparent, after lining up the photos, that the OP was quite clever and knew her backyard very well. She posed her orange kitty on the very same rock the night visitor was stepping onto. Sorry that that is not very apparent in my mosh-up, but it was clear to me when I fade the opacity of the layers in and out in PhotoShop. So the two are equidistant from the camera in my composite.
Further, both animals are seen in a three-quarters view - one towards the camera, one away from the camera. So that can't be used as an excuse for one looking much bigger. In fact, it is the night cat that is facing away from the camera and should look slightly smaller than it actually is (at least its head end) and the orange kitty's head should be closer and look bigger.
Looks to me like the orange kitty only comes up to the turn of the shoulder of the night visitor. Maybe not big enough for a cougar (I'll let others decide), but certainly too big for even the biggest domestic cat.
Not really. Notice that Kitty #1 has it's left hind foot on top of the oval rock. This oval rock is behind kitty #2, It's foot is on the ground. So #2 is lower in the shot, making it appear to be shorter.