Dvoretsky's Endgame Manual vs Fundamental Chess Endings I want to know what the differences are between "Dvoretsky's Endgame Manual" and "Fundamental Chess Endings".

I want to know also if these books are compatible, I mean, if I buy for example "Dvoretsky's Endgame Manual", it would be useless to buy "Fundamental Chess Endings" because they are very similar in his ideas or the examples that they show, or it is OK to have both books? I'm a 2100+ FIDE rated player, and that's why I want to buy these books, because I think they are for my level already.
They are both great, I agree that you should get both.

Dvoretsky's Endgame Manual is perhaps more instructive since it has slightly more explanatory text and tries to organize the material around rules for reader to learn, while Fundamental Chess Endings has more examples in about the same number of total pages. They both focus on practical examples from real games with very few pieces left.

In the end it's not the books you buy, but the work you put in, that matters.