If STAR WARS Jedi: Fallen Order™ generated the same gross revenue on the Epic Games Store, Respawn Entertainment would keep approximately $92,349,673 - that's $11,504,516 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $12,456,774. 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 $73,364,513.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.