Highly unlikely to be the same species. Reforestation, unless very specifically and actively managed, is “junk trees” first and it will take a few centuries to become and “old growth” forest. Still won’t be exactly the same as “before” - a different mix of animals is living there now and different environment surrounds it and there are all kinds of introduced plant species, etc. though constant change is the only constant in nature. After all, 17,000 years ago this area was just a solid sheet of ice.