Since we're in Sparrow thread, you must be pertaining to "Add Account" option, no?
If so, those are just another set of keys that are derived from the same seed phrase but with separate derivation path.

Technically, each is derived with incremented "account_index", starting from 0' of the wallet's first "account", and 1' in your first 'Add Account' button usage.
For example: If your main wallet's main account has the derivation path of (in the settings): m/84'/0'/0' (Master prvKey/Purpose'/Coin'/Account'), your Account#1 would be m/84'/0'/1'.

So basically, your entire wallet includes all of the keys and extended keys that can be derived from your seed phrase,
While your accounts are just keys from different derivation paths within the same wallet.

Since we're in Sparrow thread, you must be pertaining to "Add Account" option, no?
If so, those are just another set of keys that are derived from the same seed phrase but with separate derivation path.

Technically, each is derived with incremented "account_index", starting from 0' of the wallet's first "account", and 1' in your first 'Add Account' button usage.
For example: If your main wallet's main account has the derivation path (in the settings): m/84'/0'/0' (Master prvKey/Purpose'/Coin'/Account'), your Account#1 would be m/84'/0'/1'.

So basically, your entire wallet includes all of the keys and extended keys that can be derived from your seed phrase,
While your accounts are just keys from different derivation paths within the same wallet.