I also own a Focus RS. I can tell you that the two cars drive completely different. The RS suspension is much stiffer (particularly in Track mode), and the car handles completely different. The RS will oversteer if you want it. I can't imagine trying to get my FFE to oversteer.
And, the speed limiter is set much higher on the RS than the FFE.
GONE - 2015 FFE, Magnetic with leather interior, debadged & tinted
38,500 miles (since May 2015), average 246 Wh/mile
REPLACED WITH - 2018 Tesla Model3, LR RWD, Obsidian Black
20,000 miles (since Nov 2018), average 235 Wh/mile