Yea at this point the match would be suspect at best.
As far as who would be who? NNN can of course KO any version of Fedor 100%. Also, if Fedor faces a NNN that blows his wad like he did in the first Stipe fight he’s fucked. Gassed NNN that Stipe had with prime Fedor wouldn’t be a fun night for NNN. They both have ways to win, I don’t see NNN being as easy to arm bar as some of the goons Fedor disposed of that were still fresh early in the fight. I can see it happening if he’s spent and fatigued.
The thing I also consider is what it Fedor was in his prime today and was training in the same mma climate as NNN. What if NNN trained primarily in the early 2000’s and faced Fedor then? Probably would get arm bared.