code: def specimen_compatible?(target, source)
        target.class === source and
        specimen_parent_compatible?(target, source) and
        (target.specimen_type == source.specimen_type or source.specimen_type == 'Not Specified') and
        (target.pathological_status == source.pathological_status or source.pathological_status == 'Not Specified')
      end
docs: Returns whether the given specimens are compatible. The target is compatible with the source
   if each of the following conditions hold:
   * The specimen types are equal or the source specimen type is +Not Specified+
   * The specimen pathological statuses are equal or the source pathological status is +Not Specified+
   * The parent specimens are compatible, if they exist
  
   @param [Resource] target the mnerge target specimen
   @param [Resource] source the mnerge source specimen
   @return [Boolean] whether the specimens are compatible