Did you click on the muscles worked because it shows the illustrations if you click on the name of the muscle. Or don't you want each individual muscle but one photo that shows all the muscles worked. If so, then yeah, I'd agree that you're being nitpicky.
Barbell Bench Press
Lots more stabilzers in the pull-ups.
notice that you have actually more synergistic muscles with the pull-down. What this means is that you use more muscles to help the movement. This isn't really good because using more muscles to do a movement means all muscles are worked less strenously. That's why pull-ups are harder than pull-downs.
Also, are body weight squats and weighted squats functionally the same? It would seem that weighted squats would require greater recruitment of the stabilization muscles.
There are a wide variety of squat types that will target all sorts of different muscles. Sure, squatting with a weight on your back is going to work different muscles than a bodyweight squat, as will squatting with the bar on your upper chest, as will squatting with the bar overhead, as will doing sumo squats. The problem with weighted squats is that in order to do them safely, you need a bar, weights, a power rack.