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Sorry for answering my self! ;) Looks like I can use same key!

   $referenceNode = [
      'type' => 'paragraph'
   ];
   $styles = $docx->getWordStyles($referenceNode);

$contents = $docx->getWordContents($referenceNode);
foreach ($contents as $key => $item) {
   if (empty($styles[$key]['pStyle']['val'])) {
      continue;
   }
   $style = $styles[$key]['pStyle']['val'];
   echo $style.' - ';
   echo $item."\n";
}