head to head
Neither is simply harder - they are hard in different places. King of the Castle demands more reads; Pokémon Battle Revolution demands more optimization.

Reads · Pure Mind Games
A social narrative party game of human players scheming for control of a kingdom.

Reads · Mind & Math
Predicting a human trainer's switches atop team-building math and damage rolls.
King of the Castle leans Reads (Pure Mind Games); Pokémon Battle Revolution leans Reads (Mind & Math).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
King of the Castle
Voting and chatting, no twitch demand
Pokémon Battle Revolution
Turn-based menu selection requires no dexterity
King of the Castle leans clearly harder on reads.
King of the Castle
Outmaneuvering many human players' alliances is the core
Pokémon Battle Revolution
Wi-Fi battles hinge on predicting switches and protects
Pokémon Battle Revolution leans a little harder on variance, though the gap is small.
King of the Castle
Some random events shift the political landscape
Pokémon Battle Revolution
Damage rolls, crits and status procs sway turns
Pokémon Battle Revolution leans clearly harder on optimization.
King of the Castle
Managing factions and resources underpins the social play
Pokémon Battle Revolution
Team building and type-matchup math underpin every battle
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.