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
A boxing game about memorizing scripted opponent tells and executing precise dodges.

Execution · Practiced Mastery
Fast 90s shooter movement and aim through maze levels packed with secrets.
Punch-Out!! leans Execution (Practiced Mastery); Shadow Warrior leans Execution (Practiced Mastery).
Punch-Out!! leans a little harder on execution, though the gap is small.
Punch-Out!!
precise dodge and punch timing
Shadow Warrior
Build-engine speed, aim and movement carry every firefight
Shadow Warrior leans a little harder on reads, though the gap is small.
Punch-Out!!
scripted opponent tells, not truly adaptive
Shadow Warrior
Multiplayer existed but enemies are scripted spawns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Punch-Out!!
minimal randomness in fights
Shadow Warrior
Secrets are fixed in place across playthroughs
Punch-Out!! leans a little harder on optimization, though the gap is small.
Punch-Out!!
memorizing fixed opponent attack patterns
Shadow Warrior
Level routes, keys and secret knowledge reward 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.