Why are my hand lines and finger prints different from the other side?

Each finger has a different fingerprint, even on you, no two are the same. In palmistry, the lines on your dominant hand are your experiences in life, while your passive hand is your potential, what you came in with. But setting that aside, you do not use your hands equally unless you are more ambidextrous, so the lines in the hand will be similar to a point but based on use and life experience each hand will have differences.