A   B  C
Typ1 109 71 30
Typ2 19  56 99

Obj1 25  60 80


schlüssel-obj1-typ1 = abs(25 - 109) + abs(60 - 71) + abs(30 - 80)
schlüssel-obj1-typ1 = 145

schlüssel-obj1-typ2 = abs(25 -  19) + abs(60 - 56) + abs(30 - 99)
schlüssel-obj1-typ2 = 79

allgemein:
schlüssel = abs(objX->A - typY->A) + abs(objX->B - typY->B) + abs(objX->C - typY->C)