head to head
Reigns asks more than Pokémon Mystery Dungeon: Red Rescue Team, and the gap is reads.

Variance · Systems & Chaos
Turn-based resource management through randomly generated dungeon layouts.

Variance · Systems & Chaos
A narrative card game where balancing four meters under random event draws is more luck-management than strategy.
Pokémon Mystery Dungeon: Red Rescue Team leans Variance (Systems & Chaos); Reigns 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.
Pokémon Mystery Dungeon: Red Rescue Team
Turn-based grid movement - no twitch demands
Reigns
Swiping cards left or right has no skill dimension
Reigns leans clearly harder on reads.
Pokémon Mystery Dungeon: Red Rescue Team
Wild Pokémon follow simple deterministic AI
Reigns
Card characters react to prior choices in semi-scripted ways
Reigns leans a little harder on variance, though the gap is small.
Pokémon Mystery Dungeon: Red Rescue Team
Random dungeon layouts, items and encounters each run
Reigns
Event card ordering and hidden outcome RNG dominate play
Pokémon Mystery Dungeon: Red Rescue Team leans a little harder on optimization, though the gap is small.
Pokémon Mystery Dungeon: Red Rescue Team
Team building, item management and type matchups carry runs
Reigns
Learning which choice chains balance the four meters is mappable
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.