head to head
Portal 2 asks more than Snipperclips, and the gap is optimization.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
A cooperative puzzle game where players snip each other's paper characters into useful shapes.
Portal 2 leans Optimization (Pure Optimization); Snipperclips leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
Portal placement requires some precision but timing is lenient.
Snipperclips
Cutting precise shapes takes some manual finesse
Snipperclips leans a little harder on reads, though the gap is small.
Portal 2
No opponent; puzzles are static.
Snipperclips
Partners cooperate rather than oppose you
Snipperclips leans a little harder on variance, though the gap is small.
Portal 2
Puzzles are deterministic with no randomness.
Snipperclips
Puzzles are fixed and fully visible
Portal 2 leans clearly harder on optimization.
Portal 2
Solving the puzzle's logic IS the entire game.
Snipperclips
Each puzzle has discoverable shape solutions
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.