Very similar to their Damnation offering. If you're looking for Opeth's earlier work go elsewhere. But, if you want the Damnation sound this is it...only different. So difficult to describe Opeth.

Heritage is much more varied than Damnation.
To me, all of Damnation is on one emotional, dynamic and atmospheric level. Heritage varies between heavy, folky, jazzy and prog. It also doesn't depend on Mellotron as much as Damnation.
Heritage is holding up on repeated listenings much better, for me, than Damnation.