head to head
Ring of Elysium asks more than DayZ, and the gap is execution.

Variance · Grand Arena
Hardcore survival sandbox where other players are scarier than the zombies.

Execution · Grand Arena
Gunfight execution and human prediction under randomised loot and storms.
DayZ leans Variance (Grand Arena); Ring of Elysium leans Execution (Grand Arena).
Ring of Elysium leans clearly harder on execution.
DayZ
gunfights punish slow hands severely
Ring of Elysium
Gunfights are won by aim and movement first
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
DayZ
every survivor met may lie, ambush, or befriend
Ring of Elysium
Outguessing human rotations and pushes is constant
DayZ leans a little harder on variance, though the gap is small.
DayZ
loot spawns and who you meet are unknowable
Ring of Elysium
Loot spawns and storm path randomise every match
DayZ leans a little harder on optimization, though the gap is small.
DayZ
map knowledge and survival routines compound
Ring of Elysium
Drop routes and rescue-flight positioning reward planning
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.