Andrew: they may be similar.

Here's my understanding:

Net Insolvent Amount = Total value of Debt - Total value of Collateral, summed across all insolvent accounts.

source: https://medium.com/gauntlet-networks/var-deepdive-b4a9b6097e9f

Loan-to-Value = maximum amount of assets than can be borrowed with a specific collateral, expressed as %.

source: https://docs.aave.com/risk/asset-risk/risk-parameters

My understanding is that the former (net insolvent value) can be used to calculate value-at-risk, while the latter (loan-to-value) is a risk parameter the protocol sets.

I was trying to see if i could somehow query NIV on Dune.