About 4 inches. The FB/EK column in shorter to accommodate the dished steering wheel of those models. You can put an FE/FC wheel on an FB/EK column to move it closer to the dash, but it also means the wheel is closer to the seat. After a few hours of driving like that you'll swagger like John Wayne
A smaller circumference wheel will negate that effect, but it makes the steering a lot heavier. Parallel parking or 3-point turns aren't much fun in an FE/FC with a 10" steering wheel, I can tell you from experience.
cheers
RET