I see a difference now comparing the 2 screenshots.
Screenshot 1 is True widescreen. Notice the zoom: 1.50 and how far away the plane is.
Screenshot 2 is False widescreen. Same angle. Notice the zoom: 1.50 (the same as shot 1) but this time notice how close the plane is with the same zoom rate. Also notice my FPS.
With wideview false, my screenshots are clipped. With wideview true, my FPS get cut. What to do....
EDIT: 2 more
Zoom rate untouched on these 2
Apparently there is a frame loss on my system but I simply did not notice it because the loss was not 5-8 frames... and I ignore frame counters too.
These were taken at the exact same place (Chicago, runway 32L at about 10am this morning) with the same plane. BOTH are set to exactly 1.0 zoom
Wide Screen Enabled = 16.6FPS

Wide Screen Disabled = 18.0FPS (which is my frame lock)

I am running the new FSGenesis USA Landclass which is based on the latest data so I get buildings in areas you do not if you may be wondering why it looks a bit different. I just noticed I am sitting a few feet forward in the first shot.
So I am loosing about 2-3 frames by setting wide view as it was bouncing up and down a bit.
I do not notice any difference in performance when flying though
Looking at your shots and assuming you were set to exactly 1.0 zoom in both of your shots, it looks like your monitor is stretching the image (just a tad) in wide screen mode. Looking at the bottom of the 2 images (wide and normal) it seems like the runway is a tad blurred as compared to under the aircraft and forward of it.
Also, in normal mode it appears your monitor is not centering the image so the wing tips are both on the screen (that assumes you were at 1.0 in both images) That also assumes you did not SAVE the flight and reboot it because in order to reset the ZOOM correctly you must boot the flight CLEAN in both wide screen and normal mode, setting the aircraft and airport location information manually for each test. If you save the flight and reboot it, the ZOOM will be out of proportion which can stretch or make it appear zoomed in too close or distort the foreground/background ratio making the scenery appear too far way or too close n relation to the aircraft.
So now I would have to suspect one of 2 things about your system: (this assumes you did boot each flight clean with the different aspect switch in the FSX.cfg file)
1. The monitor has incorrect aspect ratio information. Check and be sure you have the latest drivers from the manufacture but it can also be a monitor OSD issue that drivers will not fix. I do not know your monitor however I would check the OSD settings and make sure they are set up correctly.
2. The native aspect ratio of your monitor is odd-ball and has some type of conflict with FSX
Something is not right because if you match your wide screen image to mine you will see my sim displays the scenery down the runway closer where yours looks like its way off in the distance.
You will also notice in both my images the wingtips are in correct relation and proportion to the dome and flat roof airport terminal/hangar location on the screen.