Which is the main difference regarding California's treatment of excess loss resulting from specified disasters in comparison to the equivalent federal rules?

California allows $100\%$ of the excess loss to be carried over to the next succeeding $15$ years.

The federal equivalent is unlimited while California's is limited by the AGI of the taxpayer claiming the deduction.

The federal equivalent contains enhanced three$-$year carryback periods.

California does not have excess loss treatment for specified disasters, unlike the federal which has them.