Negative. I have my PPL, and was given a coveted alternate slot!
To give some context, I am only medically qual’ed for FC1A; being RPA, ABM, CSO only.
My physical teads the same; here is what I found regarding MFS-N. My undetstanding is MFS-N includes a neuro-psychiological analysis to understand your reason (motivation) and grit to be a pilot.
https://apps.dtic.mil/dtic/tr/fulltext/u2/1036910.pdf