How do layer 2s really differ from execution sharding?

https://vitalik.eth.limo/general/2024/05/23/l2exec.html

L2 solutions are protocols built on top of a blockchain (Layer 1, or L1) to improve its scalability and efficiency. They process transactions off the main chain, reducing the load on L1.

Mutual follow🔁 
Shared value creation💰 

Execution sharding is a method of dividing the blockchain's state and transaction processing workload across multiple shards, which are smaller, interlinked chains. Each shard processes its own transactions and smart contracts independently but in parallel with other shards.