head to head
Splatoon 2 asks more than Ultimate Chicken Horse, and the gap is optimization.

Execution · Practiced Mastery
A team shooter where aim and positioning against human opponents controls the map.

Execution · Competitive PvP
A competitive party platformer where placing obstacles to block others while surviving your own traps tests both execution and social prediction.
Splatoon 2 leans Execution (Practiced Mastery); Ultimate Chicken Horse 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.
Splatoon 2
aim and movement decide ink battles
Ultimate Chicken Horse
Precise platforming through player-built obstacle courses is the ceiling
Ultimate Chicken Horse leans a little harder on reads, though the gap is small.
Splatoon 2
predicting human opponent positioning
Ultimate Chicken Horse
Predicting what obstacles opponents will place is genuine social reads
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Splatoon 2
weapon and map rotation randomness
Ultimate Chicken Horse
Block placement creates novel layouts each round
Splatoon 2 leans clearly harder on optimization.
Splatoon 2
loadout and turf strategy solvable
Ultimate Chicken Horse
Optimal obstacle placement strategies are learnable over sessions
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.