"A jettisoned weapon may be used by any ’Mech that is a variant of the ’Mech the weapon was originally designed for, as long as the variant features that exact weapon and in the exact same location."
means you can only pass the same piece of gear around. i guess that would be useful if you had two phoenix hawks but only one functioning large laser since there are no other pieces of detachable equipment you can plug into that spot.