If Monster Hunter Wilds generated the same gross revenue on the Epic Games Store, CAPCOM Co., Ltd. would keep approximately $347,321,395 - that's $34,683,763 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $47,225,645. 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 $276,182,928.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.