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.

Variance · Systems & Chaos
The harder sequel that swaps doors for a mask and forces a frantic multitasking routine against more animatronics.

Optimization · Systems & Chaos
Racing the day cycle to stack items faster than the seed punishes you.
Five Nights at Freddy's 2 leans Variance (Systems & Chaos); Muck leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Five Nights at Freddy's 2
Mask, flashlight, and music box juggling demands fast hands
Muck
Kiting bosses and dodging demands basic action skill
Five Nights at Freddy's 2 leans a little harder on reads, though the gap is small.
Five Nights at Freddy's 2
RNG-driven animatronics, not adaptive opponents
Muck
Enemies swarm on simple scripts
Five Nights at Freddy's 2 leans a little harder on variance, though the gap is small.
Five Nights at Freddy's 2
More stalkers, more hidden movement rolls
Muck
Seeds, chest rolls and item drops shape every run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Five Nights at Freddy's 2
Optimal check rotations make late nights solvable
Muck
Power-stacking economy and day-loop routing decide survival
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.