float $bbox1[] = `exactWorldBoundingBox object1`;
print("Bounding box ranges from: " +
$bbox1[0] + "," + $bbox1[1] + "," + $bbox1[2] + ", to " +
$bbox1[3] + "," + $bbox1[4] + "," + $bbox1[5] + ".\n");
float $bbox2[] = `exactWorldBoundingBox object2`;
print("Bounding box ranges from: " +
$bbox2[0] + "," + $bbox2[1] + "," + $bbox2[2] + ", to " +
$bbox2[3] + "," + $bbox2[4] + "," + $bbox2[5] + ".\n");
$scaleX = abs($bbox1[3] - $bbox1[0])/abs($bbox2[3] - $bbox2[0]);
$scaleY = abs($bbox1[4] - $bbox1[1])/abs($bbox2[4] - $bbox2[1]);
$scaleZ = abs($bbox1[5] - $bbox1[2])/abs($bbox2[5] - $bbox2[2]);
три последних значения и будут показатели масштаба по каждой оси, для точного "подгона" модели 2 к 1. Просто скопируйте их из скрипт едитора и вставьте в соответствующие каналы второй модели.