no you can't use the same prop for both directions. if you're looking straight down at the prop in your hand, one direction prop will have the higher edge of the blade in your right hand and the other direction should put the high edge in your left hand. The high side of the prop is what gives you lift...like redbull. You'd need 3 clockwise and 3 counter clockwise props for a hex.
The right direction is the difference between having a highly tuned aero machine or just having a freekin expensive desk fan imho.