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.

Optimization · Practiced Mastery
The original loot-driven co-op shooter set on the bandit world of Pandora.

Optimization · Practiced Mastery
Building card decks that out-value scripted bosses in real-time battles.
Borderlands leans Optimization (Practiced Mastery); Kingdom Hearts Re:Chain of Memories leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands
Standard FPS aim; numbers matter more than precision
Kingdom Hearts Re:Chain of Memories
Real-time card play needs timing but not twitch mastery
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands
Bandits and skags are scripted
Kingdom Hearts Re:Chain of Memories
Bosses break cards with scripted, learnable values
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands
Procedural loot drops gate your power
Kingdom Hearts Re:Chain of Memories
Card draws within your deck vary each fight
Kingdom Hearts Re:Chain of Memories leans a little harder on optimization, though the gap is small.
Borderlands
Builds, gear math, and farming routes dominate
Kingdom Hearts Re:Chain of Memories
Deck construction and sleight knowledge dominate outcomes
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.