Pjiang/863211 or other experts: Same/similar job (I-485)

Pjiang/863211 or other experts: I have a question regarding same/similar job. I plan to change my job soon and do the H1-B transfer. The old job is electrical engineer (job code 003 for H-1B). The job code for the new job could be 030 for H-1B (system architect). Both companies are in the wireless communication field. I will use H-1B transfer. Are those two jobs considered same/similar? Will the job change affect my pending I-485? My EB2 I-485 is pending with PD 02/2006. Want to make sure I fully understand the risk associated with the job change. I will try to work with the lawyer from the new company to use same job code and job deion but it might be difficult. Thanks a lot.