head to head
Mortal Kombat asks more than Lethal League, and the gap is optimization.

Execution · Competitive PvP
A PvP fighter where players smack an accelerating ball at each other until someone dies.

Reads · Competitive PvP
The 2011 reboot that returned Mortal Kombat to brutal 2D fighting fundamentals.
Lethal League leans Execution (Competitive PvP); Mortal Kombat leans Reads (Competitive PvP).
Lethal League leans a little harder on execution, though the gap is small.
Lethal League
Hitting a ball at absurd speeds demands frame-tight timing
Mortal Kombat
Combo execution and punish timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Lethal League
Human duels hinge on baiting and predicting swings
Mortal Kombat
Human opponents adapt; conditioning and counter-guessing rule
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Lethal League
Ball physics are deterministic
Mortal Kombat
Near-deterministic systems
Mortal Kombat leans clearly harder on optimization.
Lethal League
Small movesets, light character knowledge layer
Mortal Kombat
Frame data and matchup study converge to known answers
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.