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.
Through evoking an emotional response.
1. In truth, I found myself incorrigible with respect to Order; and now I am grown old, and my memory bad, I feel very sensibly the want of it.
2. . But, on the whole, tho' I never arrived at the perfection I had been so ambitious of obtaining, but fell far short of it, yet I was, by the endeavour, a better and a happier man than I otherwise should have been if I had not attempted it; as those who aim at perfect writing by imitating the engraved copies, tho' they never reach the wish'd-for excellence of those copies, their hand is mended by the endeavor, and is tolerable while it continues fair and legible.
Absolutely positive these answers are correct.