head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Competitive PvP
Analog-stick boxing testing punch precision and counter-baiting against human opponents.

Execution · Competitive PvP
Classic fighting execution and human prediction atop a famously unbalanced roster.
Fight Night 2004 leans Execution (Competitive PvP); Mortal Kombat Trilogy leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Fight Night 2004
Analog punch control and block timing are the core test
Mortal Kombat Trilogy
Dial-a-combo inputs and run-meter pressure demand fast hands
Mortal Kombat Trilogy leans a little harder on reads, though the gap is small.
Fight Night 2004
Versus humans, baiting counters and feinting is genuine prediction
Mortal Kombat Trilogy
Human opponents must be baited into unsafe moves
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fight Night 2004
Outcomes follow inputs with little randomness
Mortal Kombat Trilogy
Movesets are public; nothing hidden in a match
Mortal Kombat Trilogy leans a little harder on optimization, though the gap is small.
Fight Night 2004
Stat training and stamina management add a planning layer
Mortal Kombat Trilogy
Knowing the bloated roster's broken tech is half the battle
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.