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
Anime soulslike pairing pattern-learning boss fights with flexible class builds.

Optimization · Practiced Mastery
A PSP prequel following three keyblade wielders with a deep command-melding build system.
Code Vein leans Execution (Practiced Mastery); Kingdom Hearts Birth by Sleep leans Optimization (Practiced Mastery).
Code Vein leans a little harder on execution, though the gap is small.
Code Vein
Dodge timing and stamina management in melee
Kingdom Hearts Birth by Sleep
Dodge timing against brutal secret bosses
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Code Vein
Bosses are scripted patterns, never adaptive
Kingdom Hearts Birth by Sleep
Pattern-based bosses, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Code Vein
Fixed enemy placement; minor drop randomness
Kingdom Hearts Birth by Sleep
Command melding outcomes are documented
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Code Vein
Blood codes and gift builds reward theorycraft
Kingdom Hearts Birth by Sleep
Command deck melding largely solves 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.