Portability issue - Transfer within the office

[AKB_ASN_83]

Hi,

I have been working full time at an investment bank for last 3 years. My I-140 was approved 8 months back. My company went for a re-org and a new PERM was filed. The new PERM got approved a week back and the company has re-initiated the I-140 process. In the meantime i have negotiations going on with another bank for a full time position. The offer is due to be processed in 7-10 days. 

My question is - if my new I-140 comes before the offer from the other bank is processed, would the 6 month portability kick in place and i would need to stay in my current bank for 6 more months  or can I carry over my old I-140 and extend my H1 for 3 years in the new bank?

Any help is highly appreciated. 

Thanks