Poll with comments: skill tree.

Well, it seems we're talking about different things again. If, by level 20, we have two heroes with the same set of skills, it doesn't necessarily mean that they have the same skill trees in that particular save. In my understanding, identical skill trees mean a complete match of all possible skill upgrade options.
They say that Das and Shakti have the same set of skill trees; I haven't checked myself, but it could very well be true.