head to head
Far Cry Primal asks more than Grand Theft Auto: San Andreas, and the gap is execution.

Execution · Practiced Mastery
Open-world Stone Age action game about hunting and conquering tribal outposts with tamed beasts.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.
Far Cry Primal leans Execution (Practiced Mastery); Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery).
Far Cry Primal leans clearly harder on execution.
Far Cry Primal
Bow aim, melee timing, beast control under pressure
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Far Cry Primal leans a little harder on reads, though the gap is small.
Far Cry Primal
Scripted tribal AI never models the player
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Far Cry Primal leans a little harder on variance, though the gap is small.
Far Cry Primal
Wildlife encounters and patrol spawns are random
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Grand Theft Auto: San Andreas leans a little harder on optimization, though the gap is small.
Far Cry Primal
Outpost routes, crafting economy, beast taming order
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
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.