How is Malcolm's lust for wealth different from Macbeth's ambition for power?

For all of the faults that Malcolm lists to Macduff, the main difference from Macbeth is that Malcolm's faults aren't real. He is just telling them to Macduff to test how he would respond to a bad leader, then assures Macduff that he is blameless of all of those faults and actually does not covet wealth in the way he said he did.