Binance BTC Quarterly Futures - COIN M vs. USDS M - Big difference in Liquidation price?

Hello all,

Can anybody explain in layman's terms why there is such a big difference in the liquidation price of the BTC Quarterly Futures contract when using Coin M vs. USDS M? Assuming a BTC (or entry) price of $40k, total quantity of 2, with balance of 1 BTC (i.e. 50% margin or 2x leverage) I see:

Coin M Liquidation price - $26,933

????

USDS M Liquidation price - $20,408

????

Why is there a difference of ~30%???

Thanks in advance!