If Lara Croft and the Guardian of Light generated the same gross revenue on the Epic Games Store, Crystal Dynamics would keep approximately $1,358,811 - that's $373,393 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $48,929. 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 $985,418.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.