head to head
PaRappa the Rapper asks more than Space Channel 5: Part 2, and the gap is execution.

Execution · Pure Mechanics
Pioneering rhythm game where a rapping dog believes his way through button-cue raps.

Execution · Practiced Mastery
A stylish call-and-response rhythm adventure where reporter Ulala dances to save the galaxy.
PaRappa the Rapper leans Execution (Pure Mechanics); Space Channel 5: Part 2 leans Execution (Practiced Mastery).
PaRappa the Rapper leans clearly harder on execution.
PaRappa the Rapper
Hitting button cues on beat is the whole game
Space Channel 5: Part 2
Precise timing on call-and-response button sequences
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
PaRappa the Rapper
No opponent; teachers follow set lines
Space Channel 5: Part 2
Sequences are scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
PaRappa the Rapper
Songs are fixed sequences
Space Channel 5: Part 2
First playthrough hides upcoming commands
Space Channel 5: Part 2 leans a little harder on optimization, though the gap is small.
PaRappa the Rapper
Freestyle scoring quirks for Cool rank
Space Channel 5: Part 2
Memorizing every routine for perfect runs
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.