FP,
Both TKs show a stress fracture at the top of the skull. Looking closer at the TKs under the glass the 98/05 TK looks bigger. Have nothing to measure with at home. However size is not the issue here. The depth of the 84/98 TK into the material is as well as the detail. I can only express my opinion and provide some of the variables that can cause this type of distortion and fracture,
