If Sid Meier’s Civilization® VI generated the same gross revenue on the Epic Games Store, Firaxis Games would keep approximately $310,426,817 - that's $31,329,711 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $42,194,566. 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 $246,834,968.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.