Quoted:
No, No, NO! I'm not trolling. Seriously, I am not interested in stopping people. This has nothing to do with which one stops better. I want to know strictly about penetration, and specifically, if energy is directly related to penetration. This should be strictly scientific, not based on "stopping power" or some other statistics based theory.

For practical purposes, assume that we have two identicle bullets, except for their mass. The bullet with less mass is going faster than the bullet with more mass. Energy is the same. Will they both penetrate the same, or is there another variable that I've missed?