head to head
Buckshot Roulette asks more than Crusader Kings II, and the gap is variance.

Variance · Systems & Chaos
A tense one-on-one Russian roulette duel with a shotgun.

Optimization · Systems & Chaos
Medieval dynasty sim with chaotic event-driven stories.
Buckshot Roulette leans Variance (Systems & Chaos); Crusader Kings II leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Buckshot Roulette
Trivial click inputs.
Crusader Kings II
pausable, no reflex
Buckshot Roulette leans a little harder on reads, though the gap is small.
Buckshot Roulette
Dealer has minor adaptive bluff tells.
Crusader Kings II
AI characters scripted not adaptive
Buckshot Roulette leans clearly harder on variance.
Buckshot Roulette
Shell order is hidden and random.
Crusader Kings II
dynastic events, traits, intrigue
Crusader Kings II leans a little harder on optimization, though the gap is small.
Buckshot Roulette
Probability tracking and item use reward optimization.
Crusader Kings II
succession, marriages, claims plannable
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.