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
Deliberate retro platform execution with character-swap route planning.

Execution · Practiced Mastery
Crisp NES licensed platformer about chipmunks hurling crates at robots.
Bloodstained: Curse of the Moon leans Execution (Practiced Mastery); Chip 'n Dale Rescue Rangers 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.
Bloodstained: Curse of the Moon
Stiff retro jumps and boss dodges demand committed inputs
Chip 'n Dale Rescue Rangers
Tight jumps and box-throw timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Bloodstained: Curse of the Moon
Bosses telegraph from strictly fixed scripts
Chip 'n Dale Rescue Rangers
Enemies are simple fixed patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Bloodstained: Curse of the Moon
Levels are deterministic on every run
Chip 'n Dale Rescue Rangers
Deterministic levels
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Bloodstained: Curse of the Moon
Character-swap routing and branch choices reward planning
Chip 'n Dale Rescue Rangers
Level memory and boss pattern knowledge
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.