I assume there will be a fair amount of overlap...all FedExCup Playoff courses are likely in both, TPCs like Sawgrass, Scottsdale, etc. will probably be in both, too.
But still, 20 in 2K's game is a decent increase from the 15 that were in 2K21 at launch, and they added courses from across the pond and outside the US, which were sorely missing.