As a European I still don't know how their football fields compare to our football fields. I mentally assume they are the same to have a frame of comparison.
They are pretty much similar, though an actual football (soccer pitch) field is not fixed measures, 90-120 m in length and 45-90 m in width.
In this the american football field seems more "reliable" as a unit of measure, seemingly fixed to 91.44 x 48.8 m or 100 yards x 160 feet + the borders that may vary.
