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

Execution · Pure Mechanics
An early arcade climber demanding tight, repeatable jump execution.

Execution · Pure Mechanics
A pure physical-execution trainer - playing a real guitar accurately on time.
Donkey Kong Junior leans Execution (Pure Mechanics); Rocksmith 2014 leans Execution (Pure Mechanics).
Rocksmith 2014 leans a little harder on execution, though the gap is small.
Donkey Kong Junior
precise vine-climbing and jump timing
Rocksmith 2014
Real fretting and picking accuracy is literally the whole game
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Donkey Kong Junior
enemies follow fixed patrol patterns
Rocksmith 2014
No opponent, only the song
Donkey Kong Junior leans a little harder on variance, though the gap is small.
Donkey Kong Junior
minor enemy timing variance
Rocksmith 2014
Charts are fully known in advance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Donkey Kong Junior
minimal route memorization needed
Rocksmith 2014
Practice scheduling helps but solves nothing for your hands
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.