If Mortal Kombat 11 generated the same gross revenue on the Epic Games Store, NetherRealm Studios, QLOC, Shiver would keep approximately $109,991,172 - that's $13,108,288 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $14,862,433. Epic charges 0% on the first $1 million in annual per-app revenue and then 12% on the remaining amount. On GOG (30% cut), the developer would earn approximately $87,397,523.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.