head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
Crisp NES licensed platformer about chipmunks hurling crates at robots.

Execution · Practiced Mastery
Simon Belmont's SNES remake-quest with a multidirectional whip and a moody trek to Dracula.
Chip 'n Dale Rescue Rangers leans Execution (Practiced Mastery); Super Castlevania IV leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Chip 'n Dale Rescue Rangers
Tight jumps and box-throw timing
Super Castlevania IV
Eight-way whip control and stair commitment test precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Chip 'n Dale Rescue Rangers
Enemies are simple fixed patterns
Super Castlevania IV
Classic scripted monster patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Chip 'n Dale Rescue Rangers
Deterministic levels
Super Castlevania IV
Hidden wall meat, fixed locations
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Chip 'n Dale Rescue Rangers
Level memory and boss pattern knowledge
Super Castlevania IV
Subweapon choice and boss pattern study
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.