Approved L1A petition of any use if I join back the L1A employer

Hi,

Brief History

  1. I have L1A peition from company A with validity of L1A petition till Mid of 2014. I got my H1B processed from Company B and petition was approved with Change of status starting Oct 1, 2012. I joined Company B and currently working for Company B with H1B validity till Dec 2013.

  2. If company A is willing to offer me employment in US, I believe I can transfer the H1B and join the company A and be in US till Dec 13, will my ealier approved L1A Petition be of any use ?