Pjiang, help--A Number for EAD renew

Pjiang:
I submitted my 140 at Dece 2006, 485 and EAD application at July 2007. Now I am going to renew my EAD, but I am confused with the A number.

1 I have A number on my old EAD card, which is same with the A number on my I140 approvel notice( My 140 was apporved at Jun 2008).
2 On my 485 receipt, I have different A number.

Which number should I used to my EAD renew? Many thanks