Can a Nonce Be Reused in Different Blocks?
Yes, a nonce can be reused across different blocks, but it must be unique within the context of a single block header's data to produce a unique hash for that specific block. Since each block has different data (transactions, previous block hash, timestamp), the combination of block data and a reused nonce will almost certainly yield a different hash, satisfying the "Number Only Used Once" concept for the hashing attempt.
Glossar
The Nonce
Variable ⎊ The Nonce is a variable data field included in the header of a Proof-of-Work (PoW) block, serving as the sole element miners are permitted to adjust during the computationally intensive mining process.
Nonce
Function ⎊ A nonce, short for "number only used once," is a crucial component of the block header in Proof-of-Work blockchains.