head to head
Mario Kart 8 asks more than Shrek Smash n' Crash Racing, and the gap is execution.

Execution · Twitch Chaos
A kart racer where controlled chaos from random items tempers otherwise precise driving skill.

Execution · Twitch Chaos
A casual kart racer where item luck rivals driving skill.
Mario Kart 8 leans Execution (Twitch Chaos); Shrek Smash n' Crash Racing leans Execution (Twitch Chaos).
Mario Kart 8 leans clearly harder on execution.
Mario Kart 8
precise drifting and item timing matter
Shrek Smash n' Crash Racing
Basic kart handling with generous tracks
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 8
minimal, mostly reacting not predicting
Shrek Smash n' Crash Racing
Split-screen rivals add only shallow prediction
Mario Kart 8 leans clearly harder on variance.
Mario Kart 8
item boxes are heavily randomized
Shrek Smash n' Crash Racing
Random item pickups swing race outcomes
Mario Kart 8 leans clearly harder on optimization.
Mario Kart 8
track lines and item strategy solvable
Shrek Smash n' Crash Racing
Shortcut knowledge gives a modest edge
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.