head to head
The Jackbox Party Pack 3 asks more than Codenames, and the gap is variance.

Reads · Pure Mind Games
A team word game about predicting how partners will read your clues.

Reads · Bluff & Deduction
The pack with Trivia Murder Party and Fakin' It, built on out-guessing the room.
Codenames leans Reads (Pure Mind Games); The Jackbox Party Pack 3 leans Reads (Bluff & Deduction).
The Jackbox Party Pack 3 leans a little harder on execution, though the gap is small.
Codenames
No physical skill in giving word clues
The Jackbox Party Pack 3
Phones-as-controllers, near-zero dexterity.
Codenames leans a little harder on reads, though the gap is small.
Codenames
Modeling how teammates interpret your clues is the game
The Jackbox Party Pack 3
Trivia Murder Party and Fakin' It reward reading the room.
The Jackbox Party Pack 3 leans clearly harder on variance.
Codenames
The fixed board adds little randomness mid-game
The Jackbox Party Pack 3
Random prompts and question draws.
Codenames leans a little harder on optimization, though the gap is small.
Codenames
Some clue-efficiency math underlies the prediction
The Jackbox Party Pack 3
Light trivia and betting math.
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.