Your 15.6" 1920x1080 laptop is only be showing 45.88% of the total image compared to the 34" 3440x1440. (45.88% diagonally, 43.35% horizontally, 58.25% vertically)
You have to adjust the fov if you want to use the same cm/360.
If your desktop is at 105 fov, then your laptop should be at ~74.411 fov.
If your desktop is at 120 fov, your laptop should be at ~90.513 fov.
As you can see, you are currently running a much higher fov on the laptop with the same cm/360, which will feel way slower.