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

Execution · Practiced Mastery
Planning and flawlessly executing long infiltration routes with no safety net.

Optimization · Practiced Mastery
Lara raids Siberian tombs in a stealth-action adventure heavy on puzzles.
Project I.G.I.: I'm Going In leans Execution (Practiced Mastery); Rise of the Tomb Raider leans Optimization (Practiced Mastery).
Project I.G.I.: I'm Going In leans a little harder on execution, though the gap is small.
Project I.G.I.: I'm Going In
No mid-mission saves makes every shot and sprint count
Rise of the Tomb Raider
Bow aim, stealth timing, and platforming sequences.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Project I.G.I.: I'm Going In
Guards follow alarm scripts, punishing but not adaptive
Rise of the Tomb Raider
Guards follow predictable patrol scripts.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Project I.G.I.: I'm Going In
Patrols vary slightly, mostly memorisable layouts
Rise of the Tomb Raider
Tomb unknowns dissolve after one visit.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Project I.G.I.: I'm Going In
Planning infiltration routes through bases is the core test
Rise of the Tomb Raider
Tomb puzzles, crafting, and collectible routing are solvable.
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.