These are photo's of my 2023 4dr Base with the factory Sasquatch pkg and modular bumper. I included the assembly line photo. You can see the gap between the fender flare and the bumper is tighter on my Bronco. I hope this helps.
I also have deflector bought from Ford, self installed with no whistling, no rattling from the upper windshield caps. As for bugs, yes the deflector differently works with a noticeable deference regardless of wind tunnels results. On the negative side is it holds water and dirt, which for me is...