head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Variance · Systems & Chaos
Managing dice-roll risk across randomly generated maps with careful party planning.

Variance · Systems & Chaos
Turn-based resource management through randomly generated dungeon layouts.
For the King leans Variance (Systems & Chaos); Pokémon Mystery Dungeon: Red Rescue Team leans Variance (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
For the King
Turn-based slot rolls need no dexterity
Pokémon Mystery Dungeon: Red Rescue Team
Turn-based grid movement - no twitch demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
For the King
Enemies follow simple deterministic combat AI
Pokémon Mystery Dungeon: Red Rescue Team
Wild Pokémon follow simple deterministic AI
For the King leans a little harder on variance, though the gap is small.
For the King
Dice-roll combat and random maps dominate single runs
Pokémon Mystery Dungeon: Red Rescue Team
Random dungeon layouts, items and encounters each run
For the King leans a little harder on optimization, though the gap is small.
For the King
Focus economy, routing and loadout play beat the odds
Pokémon Mystery Dungeon: Red Rescue Team
Team building, item management and type matchups carry 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.