When figure A is conforming to figure B, all the rotations at the joints are being copied from figure B to figure A. E.g. if both figures have a body part called "lShoulder" and figure B has X, Y and Z rotations of 30, -15 and 10 degrees, the body part "lShoulder" in figure A will get the exact same rotation parms. The distance between joints or even the hierarchy does not matter here. Body parts are being matched by their internal names, as the display names can be different in localized versions of Poser.