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
The hardest NES Castlevania, with branching routes and switchable partner characters.

Execution · Pure Mechanics
Precision 3D platformer of narrow corridors, crates, and unforgiving jumps.
Castlevania III: Dracula's Curse leans Execution (Pure Mechanics); Crash Bandicoot leans Execution (Pure Mechanics).
Castlevania III: Dracula's Curse leans a little harder on execution, though the gap is small.
Castlevania III: Dracula's Curse
Brutal platforming and tight whip timing throughout
Crash Bandicoot
Tight jumps on narrow paths punish slop
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania III: Dracula's Curse
Scripted enemies and bosses only
Crash Bandicoot
Hazards are fixed patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania III: Dracula's Curse
Minor enemy spawn wobble
Crash Bandicoot
Everything scripted and placed
Castlevania III: Dracula's Curse leans a little harder on optimization, though the gap is small.
Castlevania III: Dracula's Curse
Partner choice, route branching, pattern memory
Crash Bandicoot
Box routes and gem requirements are learnable
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.