I am not one who condones eastern philosophies or mysticism, so I'll put my cards down on the table right away.
Having said that, I do not know all that "Karma" implies, but I can tell you within the Christian realm that we are warned that we "will reap the crop we sow" and instructed to "judge not, lest you be judged in the same likeness, and the same measure you use will be used against you."
Not knowing much about Karma, I will only say that I am sure there are some minor similarities and major differences between this Biblical doctrine and Buddhist concept.
As the scholar and philosopher C.S. Lewis pointed out - there are only two major religions in this world...Hinduism and Christianty, and they are at complete opposition to one another. Within Hinduism, all the other religions of the world can be found, but there is nothing like Christianity...it stands on its own.