Not following your Q - 回复:谢谢皮将军,若别公司file new I-129, can i shift
If your concern is PD carry-over, it is only doable when both I-140s have been approved.
If you concern adjudication of I-485 based on existing I-140, please refer to http://blog.wenxuecity.com/blogview.php?date=200711&postID=37365