List of changes between Liquity V2 (bold) and Nerite (USDN)

Major changes

Adding Superfluid to the stablecoin using the custom super-token library. It's only 5 new lines of code, but it imports the large superfluid library. Superfluid overrides the transfer function on the stablecoin to introduce additional logic, which means every place the stablecoin is minted, borrowed, deposited, withdrawn, and paid back is suspect to logic changes.
Adding a delegation function to the ActivePool.sol so ARB and other tokens used as collateral can be delegated to an outside delegate. 25 new lines of code.

Renaming the stablecoin from BOLD to USDN.
Renaming certain contract using the name Liquity to Nerite.
Updating the onchain SVG and HTML used in the trove NFTs.
Oracles used for collateral price feeds have been updated, though no code has been changed for how they are used.

Arbitrum handles block number and in some cases timestamps differently than Ethereum Mainnet. The protocol should be uneffected but verification is required.
Significantly lowered gas compensation fee
Network differences listed here: https://docs.arbitrum.io/build-decentralized-apps/arbitrum-vs-ethereum/comparison-overview
Solidity differences listed here: https://docs.arbitrum.io/build-decentralized-apps/arbitrum-vs-ethereum/solidity-support

If tokens have non-standard implementations, like different decimals or unexpected logic is could lead to issues for the protocol accepting them.