head to head
WWE SmackDown! Here Comes the Pain asks more than Castle Crashers, and the gap is reads.

Execution · Practiced Mastery
A brawler that tests combo execution and crowd management across linear gauntlets, with a light optimisation layer from its RPG progression.

Execution · Competitive PvP
Beloved PS2 wrestler combining fast arcade grappling with body-part damage and deep rosters.
Castle Crashers leans Execution (Practiced Mastery); WWE SmackDown! Here Comes the Pain leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Castle Crashers
Combo execution and crowd-control timing are the performance ceiling
WWE SmackDown! Here Comes the Pain
Fast grapple chains and counter timing
WWE SmackDown! Here Comes the Pain leans clearly harder on reads.
Castle Crashers
PvP arenas add light human-opponent reads
WWE SmackDown! Here Comes the Pain
Versus play rewards predicting counter attempts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Castle Crashers
Enemy spawns follow scripted patterns with minimal randomness
WWE SmackDown! Here Comes the Pain
Minor random elements in matches
Castle Crashers leans a little harder on optimization, though the gap is small.
Castle Crashers
Levelling investment, magic loadout, and pet choice are optimisable
WWE SmackDown! Here Comes the Pain
Body-damage targeting and move knowledge 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.