head to head
Sea of Thieves asks more than The Ship: Murder Party, and the gap is execution.

Reads · Competitive PvP
Open-world pirate game with PvPvE ship combat.

Reads · Bluff & Deduction
Cruise passengers each hunt an assigned target while acting natural enough to avoid their own assassin.
Sea of Thieves leans Reads (Competitive PvP); The Ship: Murder Party leans Reads (Bluff & Deduction).
Sea of Thieves leans clearly harder on execution.
Sea of Thieves
Ship sailing and naval gunnery require hands
The Ship: Murder Party
Landing kills and fleeing guards needs some dexterity.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sea of Thieves
PvP ship fights are pure mind games
The Ship: Murder Party
Spotting which passenger is your human hunter is psychological.
The Ship: Murder Party leans a little harder on variance, though the gap is small.
Sea of Thieves
Server encounters, weather, loot vary
The Ship: Murder Party
Unknown quarry assignments and weapon luck cloud each round.
Sea of Thieves leans a little harder on optimization, though the gap is small.
Sea of Thieves
Routes, loadouts, ship setups solvable
The Ship: Murder Party
Needs management and guard patterns are learnable systems.
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.