If Path of Exile 2 generated the same gross revenue on the Epic Games Store, Grinding Gear Games would keep approximately $107,164,109 - that's $12,851,283 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $14,476,924. 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 $85,148,723.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.