As OldTimer1 said, basic physics. Weight + energy + distance + time. Include body type leverage; bone length, muscle inserts, joints, tendon/ligament. Were all fighting gravity, push-pulling a weight/object away from earth.
If benching 300-325lbs (about average from most experience lifters..if being honest) for 8 reps, the taller man may actually be a better bencher than a shorter man. Given the above example, a taller man may be working almost twice as hard as the shorter (and perhaps , better leveraged) man over a longer distance (height). All relative to the individual bencher, of course.
The stronger lifters are the Olympic lifters (short or tall), as opposed to PL'ers. Just the fact that a weight is lifted, at a longer distance (from the ground to overhead...that distance & gravity thing again), than any power lift. Olympic lifters also are quicker at lifting overhead, another factor in basic strength . Most PL'ers can DL 400lbs, no problem. Not too many of these same men can clean that 400. Or snatch that same weight.
Not that Olympic lifters are better than PL'ers...just a different approach and use of controlled power and athletic abilities. Both are extremely powerful and hard working lifters in their sports. Using Olympic and Pl'ing movement, in a complete workout protocol may to a good advantage for a lot of men, including BB'ers..
Good Luck.
Good Luck.