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
Tetris extended into 3D - spatial packing optimization executed under accelerating pressure.

Execution · Pure Mechanics
Capcom's infamously punishing arcade platformer that makes you beat it twice for the real ending.
Blockout leans Execution (Practiced Mastery); Ghosts 'n Goblins leans Execution (Pure Mechanics).
Ghosts 'n Goblins leans a little harder on execution, though the gap is small.
Blockout
Rotating polycubes on three axes under time pressure strains hands
Ghosts 'n Goblins
Committed jumps and pixel-precise throws, no mercy
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Blockout
Solo pit - nothing to predict
Ghosts 'n Goblins
Enemy spawns are scripted
Blockout leans a little harder on variance, though the gap is small.
Blockout
Piece sequence is random but quickly bounded
Ghosts 'n Goblins
Red Arremer movement adds slight noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Blockout
3D packing has optimal layer-clearing patterns to internalise
Ghosts 'n Goblins
Weapon choice and route memorisation are mandatory
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.