Genetic analysis of one sibling relevant to other
If you are siblings, then, outside the Y chromosome (if you are a man, otherwise, you both only have X chromosomes), the results should be very similar. There might be some slight variations of course but it is unlikely to come out as important. 

If you are not siblings (e.g. you might be half-sibling if your mother is hiding an affair; sorry for suggesting this possibility but that's no so unusual), then the results might well be quite different.