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

Execution · Practiced Mastery
The fan-favourite sequel with harder levels and deeper secrets.

Execution · Practiced Mastery
Pattern memorisation and precise platforming with a solvable boss-order route.
Donkey Kong Country 2: Diddy's Kong Quest leans Execution (Practiced Mastery); Mega Man 5 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.
Donkey Kong Country 2: Diddy's Kong Quest
Demanding jump chains and animal-buddy control
Mega Man 5
Precise jumps and buster timing through gauntlet stages
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Donkey Kong Country 2: Diddy's Kong Quest
Fixed enemy patterns, no adaptation
Mega Man 5
Robot Masters cycle fixed attack patterns
Donkey Kong Country 2: Diddy's Kong Quest leans a little harder on variance, though the gap is small.
Donkey Kong Country 2: Diddy's Kong Quest
Secret Lost World entrances hidden until found
Mega Man 5
Every stage and boss is identical each attempt
Mega Man 5 leans a little harder on optimization, though the gap is small.
Donkey Kong Country 2: Diddy's Kong Quest
Routes, DK coins, and bonuses fully mappable
Mega Man 5
Weapon-order routing and pattern memorisation solve the game
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.