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
The fan-favourite sequel with harder levels and deeper secrets.

Execution · Practiced Mastery
A pastel platformer where Yoshi carries Baby Mario and perfect scores demand finding everything.
Donkey Kong Country 2: Diddy's Kong Quest leans Execution (Practiced Mastery); Super Mario World 2: Yoshi's Island leans Execution (Practiced Mastery).
Donkey Kong Country 2: Diddy's Kong Quest leans a little harder on execution, though the gap is small.
Donkey Kong Country 2: Diddy's Kong Quest
Demanding jump chains and animal-buddy control
Super Mario World 2: Yoshi's Island
Egg-aiming and flutter jumps for 100 percent scores
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
Super Mario World 2: Yoshi's Island
All enemies are scripted
Same score on variance - 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
Secret Lost World entrances hidden until found
Super Mario World 2: Yoshi's Island
Collectibles hidden only until found
Super Mario World 2: Yoshi's Island 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
Super Mario World 2: Yoshi's Island
Perfect-score runs demand full collectible routing
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.
full breakdown
Donkey Kong Country 2: Diddy's Kong Quest →
full breakdown
Super Mario World 2: Yoshi's Island →