It is a problem....I-485 approval currently in process is for your engineer position. If they RFE to confirm position description at a later date you will likely be asked to resubmit in the process under the new position. Per GCPEN, if the company works with you, you might be OK. The question is this....does your company do business with the Government. Mine does...government represents 30% of our annual sales. If they are like the company I work for they will never risk getting caught and losing its "preferred supplier" status with the government.