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

Execution · Practiced Mastery
A kart racer demanding precise boost-chain execution and route optimisation over item luck.

Execution · Pure Mechanics
A falling-capsule puzzle testing speed placement to clear virus layouts.
Crash Team Racing Nitro-Fueled leans Execution (Practiced Mastery); Dr. Mario Online Rx leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Crash Team Racing Nitro-Fueled
Boost-chain execution and power-slide timing are the lead skill
Dr. Mario Online Rx
Fast capsule placement under speed-up is the lead skill
Dr. Mario Online Rx leans a little harder on reads, though the gap is small.
Crash Team Racing Nitro-Fueled
Human multiplayer has light item-use anticipation
Dr. Mario Online Rx
Versus play adds light anticipation of opponent tempo
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Crash Team Racing Nitro-Fueled
Item boxes and battle pickups introduce real outcome randomness
Dr. Mario Online Rx
Capsule colors are random but quickly mappable
Crash Team Racing Nitro-Fueled leans a little harder on optimization, though the gap is small.
Crash Team Racing Nitro-Fueled
Track-specific boost chains and shortcut routes are fully memorisable
Dr. Mario Online Rx
Clearing virus layouts has known efficient patterns
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.