How Does the Exchange Determine the Percentage Difference between the Two Margins?

The exchange determines the percentage difference based on the volatility and liquidity of the underlying asset, as well as the risk tolerance of the exchange itself. Higher volatility or lower liquidity leads to a larger buffer (a greater difference) between the initial and maintenance margin to reduce the risk of a deficit liquidation.

Why Does an Exchange Require a Higher Margin for a Larger Position?
What Is the Practical Difference between a Maintenance Margin of 0.5% and 1.0%?
How Does a Pool Operator’s Risk Tolerance Affect Their Expected Value Calculation?
What Is the Role of Slippage Tolerance in Protecting against Front-Running?
How Does a Trader’s Order Size Relate to the Necessary Slippage Tolerance?
How Does the Slippage Tolerance Setting Affect the Vulnerability to a Sandwich Attack?
What Is a ‘Price Tolerance’ Setting and How Does It Manage Slippage Risk?
How Does a Higher Volatility Asset Affect the Required Maintenance Margin Percentage?