Watched SAI's lap and he barely ever gets the RPM blue light on in his lap, in fact during start of lap straight even the red lights don't come on (ferrari has blue lights for gearshift indicator), engages engine limiter before the end of the lap on last straight, he's definitely well within limits of the car in corners 1-4. As others have noted the floor of the car is at least a few cm higher than LEC's car, particularly during the fast bits there's still space.
I think both Ferrari drivers were heavy on fuel in their laps, they seemed to be lazy in direction changes as well, is this going to account for 1s? no idea.