I would think once you have a license number AND have passed the PE exam, you are a PE (in the state which you applied and sat for the exam). I will have the same dilemma; I took the PE exam in MN, however I live and work in WI. It happened that way because I live only 50 miles from Minneapolis, MN, but over 200 miles from Madison, WI. So immediately upon passing (still waiting, fingers crossed), I will have to send money to MN for my license number, then when I receive that, apply by commity to WI.