head to head
Grand Prix 4 asks more than Grand Theft Auto: San Andreas, and the gap is execution.

Execution · Practiced Mastery
A serious F1 simulation testing precise car control and setup optimization.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.
Grand Prix 4 leans Execution (Practiced Mastery); Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery).
Grand Prix 4 leans clearly harder on execution.
Grand Prix 4
Precise braking, throttle and racing-line control define lap times
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Grand Prix 4 leans clearly harder on reads.
Grand Prix 4
AI drivers follow scripted lines, not adapting to you
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Prix 4
Weather and grip add some unpredictability per race
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Grand Prix 4 leans a little harder on optimization, though the gap is small.
Grand Prix 4
Setup tuning and optimal lines are a deep solvable layer
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.