It does not look the same. Your screenshots show perfectly, that the toolbelt has the same width with both resolutions. That means that the image is NOT purely stretched! If the image would just be stretched on your ultrawide, the slots of the toolbelt wouldn't also be square anymore.This is how it look, exactly same screen size in 2560x1440 as 3440x1440, stretch out and looking horrible.
That's because many games calculate the fov from the aspect ratio of the resolution. But that doesn't mean that every game does that.ok thats weird, I never had to adjust fov in other games to get effect of 3440x1440, it just to setup resolution and bang there is more screen on the side.
That's common effect of high fov, if not especially compensated by the game/engine.Look at the church in this pictures, this is with fov 77, is it supposed to be like this?