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

Execution · Pure Mechanics
A 2D brawler testing counter timing and combo execution against scripted waves.

Execution · Practiced Mastery
Simon Belmont's SNES remake-quest with a multidirectional whip and a moody trek to Dracula.
Shank 2 leans Execution (Pure Mechanics); Super Castlevania IV 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.
Shank 2
Combo juggling, counters and dodge timing carry every brawl
Super Castlevania IV
Eight-way whip control and stair commitment test precision
Shank 2 leans a little harder on reads, though the gap is small.
Shank 2
Enemies telegraph fixed attacks; survival co-op stays scripted
Super Castlevania IV
Classic scripted monster patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Shank 2
Encounters are deterministic set pieces
Super Castlevania IV
Hidden wall meat, fixed locations
Super Castlevania IV leans a little harder on optimization, though the gap is small.
Shank 2
Weapon synergies and crowd-priority knowledge add depth
Super Castlevania IV
Subweapon choice and boss pattern study
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.