head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
A linear western shooter testing aim and learned encounter pacing through scripted set pieces.

Execution · Practiced Mastery
A colorful co-op beat-em-up with light RPG progression.
Call of Juarez: Bound In Blood leans Execution (Practiced Mastery); Castle Crashers Remastered 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.
Call of Juarez: Bound In Blood
Aimbot would trivialise the gunfights and showdown duels
Castle Crashers Remastered
combo timing in co-op brawler combat
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: Bound In Blood
Scripted campaign enemies; thin multiplayer adds little prediction
Castle Crashers Remastered
enemies scripted, no real adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: Bound In Blood
Encounter layouts are unknown on first run, then fixed
Castle Crashers Remastered
weapon and magic drop randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: Bound In Blood
Cover routes and concentration-mode usage are learnable patterns
Castle Crashers Remastered
leveling and weapon choices are learnable
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.