head to head
Command & Conquer: Renegade asks more than Fighting Force, and the gap is reads.

Execution · Practiced Mastery
FPS aim welded to a team economy of base-destruction priorities.

Execution · Practiced Mastery
A straightforward brawler testing crowd management with basic timing.
Command & Conquer: Renegade leans Execution (Practiced Mastery); Fighting Force leans Execution (Practiced Mastery).
Command & Conquer: Renegade leans a little harder on execution, though the gap is small.
Command & Conquer: Renegade
FPS aim in infantry and vehicle fights carries the game
Fighting Force
Crowd control and weapon swings need basic timing
Command & Conquer: Renegade leans clearly harder on reads.
Command & Conquer: Renegade
Multiplayer base assaults involve predicting human team pushes
Fighting Force
Enemy waves attack in fixed patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Command & Conquer: Renegade
Maps and economy rules are fully known
Fighting Force
Levels and pickups are static
Command & Conquer: Renegade leans a little harder on optimization, though the gap is small.
Command & Conquer: Renegade
Credit economy and building-target priority decide C&C-mode matches
Fighting Force
Route choices and weapon use are shallow systems
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.