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 · Practiced Mastery
A kart racer with an adventure structure and three vehicle types, lighter on item chaos than its rivals.

Execution · Practiced Mastery
An endless-runner shooter testing steering and aim against zombie crowds.
Diddy Kong Racing leans Execution (Practiced Mastery); Into the Dead 2 leans Execution (Practiced Mastery).
Diddy Kong Racing leans a little harder on execution, though the gap is small.
Diddy Kong Racing
Drift boosts across car, hovercraft and plane demand precision.
Into the Dead 2
Steering and aiming while auto-running drives survival
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Diddy Kong Racing
Multiplayer item duels add mild prediction; AI is scripted.
Into the Dead 2
Zombies shamble on scripts, no prediction
Into the Dead 2 leans a little harder on variance, though the gap is small.
Diddy Kong Racing
Balloon pickups and items inject moderate randomness.
Into the Dead 2
Spawn placement and pickup drops vary each run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Diddy Kong Racing
Vehicle choice, balloon upgrade routes and boss strategies converge.
Into the Dead 2
Weapon loadout and upgrade choices reward planning
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.