If Darkest Dungeon II generated the same gross revenue on the Epic Games Store, Red Hook Studios would keep approximately $18,121,865 - that's $3,279,366 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $2,334,800. 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 $14,319,666.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.