No it's the same either way.
It doesn't occur because the price of the assets increase. It happens because they change at different rates... eg...
Create liquidity providing into a pool on January 1st. Close the position and withdraw assets on February 1st - 1 month later.
Trading pool is for BTC and ETH (for eg).
If BTC increases by 100% during the month and ETH increases by 100% too, impermanent loss is 0% - nothing.
If BTC increase by 100% and ETH increases by 1%, you have some IL.
If BTC increases by 150% and ETH increases by 1%, you have more IL.
If BTC drops by 10% and ETH drops by 10%, no IL.
If ETH drops 50% and BTC drops 40%, some IL.
I think I saw that if the one asset does 500% increase and the other one stays the same, the IL is about 20% of total value.