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

Execution · Pure Mechanics
A pure reaction-timing endurance test against accelerating random obstacles.

Execution · Pure Mechanics
The NES light-gun classic of shooting ducks and enduring the dog.
Chrome Dino leans Execution (Pure Mechanics); Duck Hunt leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Chrome Dino
Jump and duck timing at accelerating speed is everything
Duck Hunt
Pure light-gun aim and reaction speed
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Chrome Dino
No opponent, just obstacles
Duck Hunt
Ducks fly on simple patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Chrome Dino
Obstacle order is random but instantly readable
Duck Hunt
Flight paths vary a little
Chrome Dino leans a little harder on optimization, though the gap is small.
Chrome Dino
Almost nothing to plan beyond reaction discipline
Duck Hunt
Almost nothing to optimise beyond aim
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.